Nicolas Pépé - Arsenal - won a free kick in defence.
Fouled by José Holebas - Olympiakos
Kieran Tierney - Arsenal - receive yellow card.
Corner - Arsenal. Conceded by José Holebas.
Fouled by Gabriel Martinelli - Arsenal
Kenny Lala - Olympiakos - won a free kick in defence.
Second Half ended - Arsenal 0, Olympiakos 1.
New attacking attempt. Pierre-Emerick Aubameyang - Arsenal - shot with left foot from the centre of the box is saved by goalkeeper in the centre of the goal. Assist - Gabriel Martinelli.
Missed chance. Pierre-Emerick Aubameyang - Arsenal - shot with right foot inside of six yard box - left side goes high following a fast break.
Fouled by Granit Xhaka - Arsenal
Granit Xhaka - Arsenal - receive yellow card for a foul.
Andreas Bouchalakis - Olympiakos - won a free kick in attack.
Fouled by Thomas Partey - Arsenal
Mohamed Mady Camara - Olympiakos - won a free kick in defence.
Substitution - Olympiakos. Andreas Bouchalakis for Konstantinos Fortounis.
Substitution - Olympiakos. Kenny Lala for Oleg Reabciuk.
SUBSTITUTION: Kenny Lala COMES ON FOR Oleg Reabciuk
SUBSTITUTION: Andreas Bouchalakis COMES ON FOR K. Fortounis
SUBSTITUTION: C. Chambers COMES ON FOR Héctor Bellerín
Second yellow card to Ousseynou Ba - Olympiakos
Ousseynou Ba - Olympiakos - receive yellow card for a foul.
Gabriel Martinelli - Arsenal - won a free kick on the left wing.
Fouled by Ousseynou Ba - Olympiakos
Substitution - Arsenal. Calum Chambers for Héctor Bellerín.
Substitution - Arsenal. Gabriel Martinelli for Emile Smith Rowe.
SUBSTITUTION: Gabriel Martinelli COMES ON FOR E. Smith Rowe
Missed chance. Pierre-Emerick Aubameyang - Arsenal - shot with left foot from the centre of the box missed. Assist - Martin Ødegaard with a through ball following a fast break.
New attacking attempt. Nicolas Pépé - Arsenal - shot with left foot from the right side of the box is saved by goalkeeper in the centre of the goal. Assist - Martin Ødegaard.
Mohamed Mady Camara - Olympiakos - won a free kick in attack.
Fouled by Pierre-Emerick Aubameyang - Arsenal
Thomas Partey - Arsenal - won a free kick in defence.
Fouled by Konstantinos Fortounis - Olympiakos
Missed chance. Martin Ødegaard - Arsenal - shot with left foot from the centre of the box goes high.
Yann M Vila - Olympiakos - receive yellow card for a foul.
Fouled by Yann M Vila - Olympiakos
Shot blocked. Bruma - Olympiakos - shot with left foot from the left side of the box is blocked. Assist - Lazar Randjelovic.
Lazar Randjelovic - Olympiakos - won a free kick in defence.
Fouled by Emile Smith Rowe - Arsenal
Thomas Partey - Arsenal - won a free kick in attack.
Fouled by Mohamed Mady Camara - Olympiakos
Missed chance. Héctor Bellerín - Arsenal - shot with the head from the centre of the box is high and wide to the left after corner.
Corner - Arsenal. Conceded by Lazar Randjelovic.
Nicolas Pépé - Arsenal - won a free kick on the right wing.
Fouled by Oleg Reabciuk - Olympiakos
Shot blocked. Konstantinos Fortounis - Olympiakos - shot with right foot from outside the box is blocked.
SUBSTITUTION: Bruma COMES ON FOR Georgios Masouras
Substitution - Olympiakos. Bruma for Giorgos Masouras.
Substitution - Olympiakos. Lazar Randjelovic for Thanasis Androutsos.
SUBSTITUTION: Lazar Randjelovic COMES ON FOR T. Androutsos
Shot blocked. Nicolas Pépé - Arsenal - shot with left foot from the centre of the box is blocked.
Fouled by Youssef El-Arabi - Olympiakos
Granit Xhaka - Arsenal - won a free kick on the left wing.
SUBSTITUTION: Martin Ødegaard COMES ON FOR Dani Ceballos
SUBSTITUTION: Thomas Partey COMES ON FOR Mohamed Elneny
Substitution - Arsenal. Martin Ødegaard for Dani Ceballos.
Substitution - Arsenal. Thomas Partey for Mohamed Elneny.
Corner - Arsenal. Conceded by Sokratis Papastathopoulos.
Goal! Arsenal 0, Olympiakos 1. Youssef El-Arabi - Olympiakos - shot with right foot from the centre of the box to the left corner. Assist - Giorgos Masouras following a fast break.
Missed chance. Youssef El-Arabi - Olympiakos - shot with the head from the centre of the box is close, but misses the top left corner. Assist - Giorgos Masouras with a cross after corner.
Shot blocked. José Holebas - Olympiakos - shot with the head from the right side of the six yard box is blocked. Assist - Konstantinos Fortounis with a cross.
Corner - Olympiakos. Conceded by Kieran Tierney.
Missed chance. Konstantinos Fortounis - Olympiakos - shot with right foot from outside the box is close, but missed to the left. Assist - Youssef El-Arabi with a head.
Corner - Arsenal. Conceded by Ousseynou Ba.
Fouled by Nicolas Pépé - Arsenal
First Half ended - Arsenal 0, Olympiakos 0.
Oleg Reabciuk - Olympiakos - won a free kick in defence.
Dani Ceballos - Arsenal - won a free kick in attack.
Fouled by Sokratis Papastathopoulos - Olympiakos
New attacking attempt. Emile Smith Rowe - Arsenal - shot with right foot from outside the box is saved in the top right corner. Assist - Dani Ceballos.
Second Half starts Arsenal 0, Olympiakos 0.
Thanasis Androutsos - Olympiakos - won a free kick in attack.
Fouled by Thanasis Androutsos - Olympiakos
Emile Smith Rowe - Arsenal - won a free kick on the left wing.
Shot blocked. Youssef El-Arabi - Olympiakos - shot with the head from the centre of the box is blocked. Assist - Oleg Reabciuk with a cross.
Missed chance. Pierre-Emerick Aubameyang - Arsenal - shot with right foot from the centre of the box is very close to the goal. Assist - Dani Ceballos.
Héctor Bellerín - Arsenal - won a free kick in defence.
Corner - Olympiakos. Conceded by Bernd Leno.
New attacking attempt. Youssef El-Arabi - Olympiakos - shot with left foot from the centre of the box is saved in the left corner. Assist - José Sá.
New attacking attempt. Gabriel Magalhães - Arsenal - shot with the head from the centre of the box is saved in the top left corner. Assist - Dani Ceballos with a cross.
Shot blocked. Nicolas Pépé - Arsenal - shot with left foot from the right side of the box is blocked.
Kieran Tierney - Arsenal - won a free kick on the left wing.
Sokratis Papastathopoulos - Olympiakos - won a free kick in defence.
Shot blocked. Emile Smith Rowe - Arsenal - shot with right foot from outside the box is blocked. Assist - Granit Xhaka.
Thats all. Game finished - Arsenal 0, Olympiakos 1.
The teams are on their way out of the tunnel - and we're about to get underway at Emirates Stadium