Good evening and welcome to live coverage of Olympiacos versus Arsenal in the first leg of this round of 32 tie in the Europa League. Teams to follow shortly.

That's it! Arsenal win 1-0, and will take a lead and an away goal back to the Emirates.

Saka finds Lacazette with a lovely ball down the left wing. Lacazette cuts his cross low into the area but it's intercepted.

Arsenal have another chance to break, but Xhaka makes a mess of his pass to Pepe and the chance escapes.

Sokratis is coming off, and is replaced by Maitland-Niles.

Ba clatters Lacazette and is booked.

We'll have have a minimum of five extra minutes.

Late trouble for Arsenal here, as Mustafi and Sokratis are both hobbling badly.

OFF THE BAR! Sokratis plants his header onto the cross bar, and from the rebound Mustafi guides a header just wide of the post.

WHAT A SAVE! Arsenal break quickly from a corner, and it's implausibly five on two. Xhaka brilliantly eads the charge and they work it to Lacazette, whose stinging shot from 18 yards is turned wide by Sa.

That was a lovely, incisive move from Arsenal and brilliant from Saka. Xhaka has just been booked for punching the ball away in frustration.

Brilliant on the break from Arsenal. Aubameyang latches on to a ball in the bottom left corner. He then cuts it back to Saka, who was butrsting into the penalty area. Saka takes a touch, plays a delicious ball across the six yard box that cuts out all of the Olympiacos defenders and Lacazette taps home.

Fortounis cuts inside from the left and gets a shot away, but drags it wide from 20 yards.

Olympiacos break now, and Lovera runs it forward and shoots from 25 yards. Luiz gets a block on it and the ball goes out for another corner.

Luiz intercepts an attempted through ball from Balbuena, and concedes a corner. It's headed out to Camara, who has a yahoo from 30 yards but slices it horribly wide.

An Olympiacos change, Lovera for Masouras.

Pepe is on for Arsenal, replacing Willock.

EXCELLENT SAVE! Balbuena whips the free kick low and to the bottom corner. It's a horrible one to deal with but Leno saves it as it bounces, and gathers the loose ball before El-Arabi can slide in and score.

Camara goes down as he tries a shot from 30 yards, and the referee awards a free kick.

Balbuena whips the ball into the back post again. Ba rises from six yards and forces an excellent, point blank save from Leno but he was offside.

El-Arabi latches on to a loose ball just outside the Arsenal area. As he wins it Mustafi cleans him out with a sliding tackle and is booked.