FT: Olympiakos 0-1 Arsenal. Arsenal have managed to win this one right at the death and it could prove to be a crucial win and away goal. I fancy them to do the business in London next week.
92'
Arsenal sub: Maitland-Niles on for Sokratis.
92'
Ba is booked for fouling Lacazette.
90'
5 minutes added time.
86'
The corner comes in and Sokratis hits the bar. The rebound is then headed wide.
85'
Great chance for Arsenal to kill the game on the counter-attack. The ball ends up with Aubameyang in the box, he shoots but Sá matches and makes a good save to put it wide.
82'
I can't believe it, Arsenal have scored. Aubameyang plays it to Saka, he crosses in along the ground and Lacazette knocks it in. 1-0 Arsenal.
Bouchalakis is booked for a foul. Arsenal will probably shoot from the free-kick.
49'
From what we've seen so far, I wouldn't say that Arsenal and United have been two convincing in tonight's matches. You'd fancy them both to go through but if they face teams like Inter and Sevilla in the next round they may struggle.
46'
And we're back.
45'
HT: Olympiacos 0-0 Arsenal. Both teams go into the break level with both sides having a few chances. A draw probably a fair result at the moment.
45'
2 minutes added time.
42'
Lacazette has a deflected half volley from just inside the box out for a corner.
37'
Not too many chances lately.
30'
Guilherme fires his long-range effort over.
28'
Close from Arsenal. Xhaka's free-kick hits Martinelli and almost catches Sá out, but he manages to save.
Tsimikas puts in a cross but it goes over the bar.
13'
Olympiacos haven't lost a home game since October...
9'
Intimidating atmosphere here. I fancy the hosts to get a goal if they stay on top.
5'
Another great chance for the hosts, The ball is crossed in but Masouras heads over from yards out.
3'
Bright start from the hosts. The ball is crossed over for Valbuena, he hits it on the volley and Leno gets down and parries, and the ball just escapes the Olympiacos players waiting to tap it in.
1'
And we're off.
Start of match
PRVW
Last match between these sides ended in a 3- win for Arsenal in Greece in 2015. In total, there have been 9 meetings between the 2, with Arsenal winning 4 and Olympiacos winning 4, with 1 draw.