Arsenal look vibrant in the closing stages. They're still probing away and are searching for a fourth goal. No sign of the Gunners sitting back on their lead.
88'
A. Lacazette enters the game and replaces P. Aubameyang.
Arteta makes yet another change, with Aubameyang going off for Lacazette up front in the closing stages of the contest.
86'
T. Androutsos enters the game and replaces G. Masouras.
Martins responds to his side conceding two in quick succession now, with Masouras replaced by Androutsos.
85'
Mohamed Elneny has scored a goal for Arsenal! Assist by Gabriel Magalhães.
Gabriel, who just gave Arsenal their lead back, played a simple pass to Elneny in a deep position, but the Egyptian wasn't closed down and came up with a sensational strike!
GOAL!!! WHAT A STRIKE FROM ELNENY!!!! Gabriel plays it short to the Egyptian on halfway and he runs, unopposed, towards the edge of the box before unleashing a swerving strike of such ferocity that Sa can't keep it out, despite getting a hand to it, palming it onto the post and in! Of the three Arsenal substitutes to have just entered the fray, Elneny seemed the most unlikely to get on the scoresheet, but he's made it 3-1 to Arsenal!
83'
Ceballos is now Arsenal's most advanced midfielder, with Smith Rowe on the left and Elneny partnering Xhaka in midfield as the Gunners look to see the game out.
82'
E. Smith Rowe enters the game and replaces M. Ødegaard.
N. Pépé enters the game and replaces B. Saka.
Mohamed Elneny enters the game and replaces Willian.
Arteta makes a triple-substitution now as he looks to see the game out. Elneny replaces Willian in the first change.
The second change is a straight swap on the right, with Saka going off for Pepe.
Arteta's third change is also a like-for-like, with Arsenal's first goalscorer Odegaard coming off for Smith Rowe.
79'
Gabriel Magalhães has scored a goal for Arsenal! Assist by Willian.
Willian received the corner very short and dinked a cross into a dangerous area where Gabriel showed great desire to meet it and nod in!
GOAL!!!! ARSENAL ARE IN FRONT AGAIN!!! A short corner is taken to Willian, who floats the ball to the back post where Gabriel charges in to glance a terrific header across goal and into the far corner beyond the reach of Sa! It's 2-1 to the Gunners now!
77'
Koka enters the game and replaces Y. El-Arabi.
The Olympiacos goalscorer, El-Arabi, is withdrawn by Martins now and replaced up front by Hassan.
75'
Willian takes on a speculative attempt from range on his weaker left foot and it's blazed high and wide of the target. That certainly won't trouble Sa.
Minute
Description
73'
Arsenal are just lacking a little bit of sharpness in their passing at the moment. They can't seem to take advantage of the spaces that appear in the Olympiacos defence.
69'
Saka cuts in from the right but is charged down just inside the box. He tries to lash one at goal but it clatters away off a defender. He had three around him then.
65'
The game has been very scrappy since Olympiacos' equaliser. The hosts look invigorated and are disrupting Arsenal's attempts to create chances.
59'
L. Ranđelović enters the game and replaces Bruma.
Martins makes a third change now in the aftermath of that goal, bringing Bruma off for Randelovic out wide.
58'
Y. El-Arabi has scored a goal for Olympiakos!
GOAL!!! OLYMPIACOS ARE LEVEL!! It's another mistake at the back from Arsenal! Leno plays the ball into Ceballos, who has his back to goal and two for company. The midfielder is robbed and El-Arabi curls into the bottom-right corner with Leno out of position! It's 1-1 now!
55'
Dani Ceballos enters the game and replaces T. Partey.
Arteta looks to protect Partey now and brings him off, with Ceballos replacing the Ghanaian in midfield.
54'
Aubameyang tries to clip the ball into the middle but nobody can get on the end of it. It's cleared half-heartedly to the edge of the box, but Tierney and Saka get in each other's way and the latter fires over the bar!
52'
Arsenal are back in command and Partey finds Tierney with a lovely switch to the left. The full-back finds Saka, but he can't wriggle past his man and Olympiacos have the ball.
50'
Olympiacos make a rare foray forward, but their passes into the final third are hopeful and pose no real threat to the Gunners.
48'
Partey thumps one at goal from distance and it bounces just before it reaches Sa, but the goalkeeper reads it well and takes it into his grasp.
46'
J. Holebas enters the game and replaces O. Reabciuk.
K. Fortounis enters the game and replaces M. Valbuena.
Martins makes a double-change at half-time as he looks for improvement from his side. Reabciuk off for Holebas at left-back is the first alteration.
Valbuena is the second player to be replaced, with attacking midfielder Fortounis coming on behind El-Arabi.
We're back underway for the second half!
45' +2
HALF-TIME: OLYMPIACOS 0-1 ARSENAL
45'
David Luiz stays forward after a set-piece is cleared. He goes down on the edge of the box and wants a free-kick but the referee waves his claims away, and Olympiacos look to break into the gap left by the defender. Saka gets back brilliantly, however, and puts in an inch-perfect tackle to stop the counter.
43'
Gabriel Magalhães gets yellow.
Gabriel is the first Arsenal player to go into the book now after a hefty challenge on Valbuena.
37'
A. Bouchalakis gets yellow.
Bouchalakis is the next Olympiacos player to go into the book for an uncompromising challenge on Aubameyang that got none of the ball.
34'
M. Ødegaard has scored a goal for Arsenal! Assist by T. Partey.
Partey gets an assist as he finds Odegaard in an advanced position, but the Norwegian had a lot to do before finding the net from the edge of the area!
GOAL!!! ARSENAL LEAD!!! What a hit by Odegaard for his first goal for the club! He's fed by Partey just outside the box and cuts onto his left before unleashing a thunderbolt of a strike that Sa flaps at and can't keep out! It's poor goalkeeping, but a terrific strike nonetheless! It's 1-0 to the Gunners!
31'
Arsenal are probing patiently, but Olympiacos have managed to keep Arsenal from creating anything of note in the last few minutes.
29'
Arsenal are controlling the game well now, keeping the ball as they wait for their next opportunity to strike. They look comfortable in possession.
27'
Bellerin isn't on the same wavelength as Odegaard on the right and there's a mix-up between the two, leading to the ball being played in behind after the right-back had stopped his run.
25'
Arsenal have a third free-kick in shooting range, but this time it's to the right of goal. Xhaka takes with his left, but it's straight into the wall.
22'
Y. M'Vila gets yellow.
M'Vila slides in recklessly on Saka on the edge of the box and gets none of the ball, earning himself a deserved yellow card.
19'
Saka darts inside before playing a reverse ball to Bellerin on the overlap, but the right-back's cross from the byline is gathered by Sa. Both full-backs are getting forward well tonight.
13'
Bruma takes on a very ambitious effort from an improbable angle and distance, and predictably scuffs it well wide of the target.
11'
Arsenal press Olympiacos high up the field and it's punted over the top into the space left in behind, but Leno races out of his box to deal with it and finds Tierney, who clears his lines.
5'
Tierney looks lively in these opening stages and the left-back makes another surging run before cutting the ball towards Willian this time, but it's intercepted.
1'
We're underway in Piraeus!
Hello and welcome to our LIVE coverage of the Europa League round of 16 first leg clash between Olympiacos and Arsenal at the Georgios Karaiskakis Stadium in Greece.
Arsenal will hope to gain revenge after being knocked out in the previous round of last season's competition by tonight's hosts. The second leg at the Emirates went to extra-time and the Gunners were eliminated on away goals, with the aggregate score tied at 2-2. Perhaps the north London outfit will favour an attacking approach in Greece tonight in order to minimise the risk of a repeat.
Arsenal XI (4-2-3-1): Bernd Leno; Hector Bellerin, David Luiz, Gabriel Magalhaes, Kieran Tierney; Thomas Partey, Granit Xhaka; Bukayo Saka, Martin Odegaard, Willian; Pierre-Emerick Aubameyang.
Arsenal substitutes: Alexandre Lacazette, Cedric Soares, Calum Chambers, Mat Ryan, Dani Ceballos, Emile Smith Rowe, Rob Holding, Pablo Mari, Karl Hein, Mohamed Elneny, Gabriel Martinelli, Nicolas Pepe.
Olympiacos substitutes: Ahmed Hassan, Vasilis Sourlis, Lazar Randjelovic, Ilias Karargyris, Konstantinos Tzolakis, Konstantinos Fortounis, Thanasis Androutsos, Jose Holebas, Mohamed Drager.
Olympiacos XI (4-4-1-1): Jose Sa; Kenny Lala, Sokratis Papastathopoulos, Yann M'Vila, Oleg Reabciuk; Bruma, Mohamed Camara, Andreas Bouchalakis, Giorgos Masouras; Mathieu Valbuena; Youssef El-Arabi.
Arsenal have looked, for most of the half, a fluid, confident and dangerous team in possession and are deservedly ahead. However, mistakes at the back continue to plague them and the Gunners must learn to cut these out.
Thank you for joining our coverage, we hope you enjoyed the game! Until next time, goodbye!
Olympiacos face Larissa in their last league game of the season next, while Arsenal host Tottenham in the north London derby as they return to Premier League action.
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