Elsewhere, Paris St-Germain and Basel have been charged by Uefa over their fans' behaviour during their Champions League games this week.
Goodnight.
FULL-TIME
Marseille 3-1 Athletic Bilbao
It's all over at the Velodrome. An entertaining game sees Marseille deservedly take a two-goal lead to the Basque Country.
DISALLOWED GOAL
Marseille 3-1 Athletic Bilbao
Clinton N'Jie has a goal correctly ruled out for offside with seconds left.
FULL-TIME
Sporting Lisbon 2-0 Viktoria Plzen
Fredy Montero's double has put Sporting in a good position for the second leg in the Czech Republic.
FULL-TIME
RB Leipzig 2-1 Zenit St Petersburg
It's all over in Germany, it was looking like a great result for Leipzig until Zenit's late away goal.
FULL-TIME
Lazio 2-2 Dynamo Kiev
Lazio won't be too happy to have drawn this, conceding two away goals. A 0-0 or 1-1 draw in Ukraine would be enough for Dynamo to progress.
INJURY TIME
Into the final few minutes of these four games now.
Post update
RB Leipzig 2-1 Zenit St Petersburg
RB Leipzig striker Timo Werner has scored 17 goals and assisted four - including to Bruma for today's opener - in 34 games this season.
GOAL - RB Leipzig 2-1 Zenit St Petersburg
Domenico Criscito (86 mins)
An excellent curling free-kick from Domenico Criscito into the top corner gives Zenit a potential vital away goal in Germany.
ReutersCopyright: Reuters
Post update
Lazio 2-2 Dynamo Kiev
Ciro Immobile has scored six goals in as many Europa League games for Lazio. He's scored 33 in 35 in all competitions this season.
GOAL - Lazio 2-2 Dynamo Kiev
Junior Moraes (79 mins)
An excellent Junior Moraes goal levels it up for Dynamo Kiev in Rome - their second away goal.
He gets the ball on the edge of the box, turns and his 20-yard shot swerves past Lazio keeper Thomas Strakosha.
ReutersCopyright: Reuters
GOAL - RB Leipzig 2-0 Zenit St Petersburg
Timo Werner (77 mins)
Liverpool-bound Naby Keita plays a ball through to Germany striker Timo Werner, who just lifts the ball over keeper Andrei Lunev.
ReutersCopyright: Reuters
Post update
AC Milan 0-2 Arsenal
Since the start of the 2015-16 campaign, Henrikh Mkhitaryan has been directly involved in more goals than any other midfielder in the Europa League (15 - nine goals and six assists).
Getty ImagesCopyright: Getty Images
Post update
Lazio 2-1 Dynamo Kiev
Each of Felipe Anderson's last seven goals have been scored at home.
SUBSTITUTION
Marseille 3-1 Athletic Bilbao
Marseille star Florian Thauvin goes off on a stretcher with what looked an innocuous-looking injury. Clinton N'Jie replaces him.
GOAL - Lazio 2-1 Dynamo Kiev
Felipe Anderson (62 mins)
Lazio go ahead, only 10 minutes after falling behind. Felipe Anderson converts Sergej Milinkovic-Savic's pass
ReutersCopyright: Reuters
GOAL - Marseille 3-1 Athletic Bilbao
Lucas Ocampos (57 mins)
Marseille reestablish a two-goal lead and it's Lucas Ocampos' second. Dimitri Payet crosses from the right and it bounces its way across to Ocampos. He takes a first-time shot which squirms past Athletic keeper Iago Herrerin at his near post.
ReutersCopyright: Reuters
Post update
AC Milan 0-2 Arsenal
Arsenal midfielder Mesut Ozil has been directly involved in 100 goals in 189 appearances for Arsenal (37 goals and 63 assists).
GOAL - RB Leipzig 1-0 Zenit St Petersburg
Bruma (56 mins)
RB Leipzig have been knocking on the door all game and they deservedly lead. Bruma picks up the ball in the box before just guiding one past the keeper.
ReutersCopyright: Reuters
GOAL - Lazio 1-1 Dynamo Kiev
Ciro Immobile (54 mins)
... but it doesn't last long as Ciro Immobile bags his 33rd goal of the season to cap off a good team passing move.
Live Reporting
Emlyn Begley
All times stated are UK
Get involved
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Latest PostGoodnight
Thanks for joining me today for coverage of eight different Europa League games.
Our main focus obviously was AC Milan v Arsenal, and you can read our match report of that game here.
Elsewhere, Paris St-Germain and Basel have been charged by Uefa over their fans' behaviour during their Champions League games this week.
Goodnight.
FULL-TIME
Marseille 3-1 Athletic Bilbao
It's all over at the Velodrome. An entertaining game sees Marseille deservedly take a two-goal lead to the Basque Country.
DISALLOWED GOAL
Marseille 3-1 Athletic Bilbao
Clinton N'Jie has a goal correctly ruled out for offside with seconds left.
FULL-TIME
Sporting Lisbon 2-0 Viktoria Plzen
Fredy Montero's double has put Sporting in a good position for the second leg in the Czech Republic.
FULL-TIME
RB Leipzig 2-1 Zenit St Petersburg
It's all over in Germany, it was looking like a great result for Leipzig until Zenit's late away goal.
FULL-TIME
Lazio 2-2 Dynamo Kiev
Lazio won't be too happy to have drawn this, conceding two away goals. A 0-0 or 1-1 draw in Ukraine would be enough for Dynamo to progress.
INJURY TIME
Into the final few minutes of these four games now.
Post update
RB Leipzig 2-1 Zenit St Petersburg
RB Leipzig striker Timo Werner has scored 17 goals and assisted four - including to Bruma for today's opener - in 34 games this season.
GOAL - RB Leipzig 2-1 Zenit St Petersburg
Domenico Criscito (86 mins)
An excellent curling free-kick from Domenico Criscito into the top corner gives Zenit a potential vital away goal in Germany.
Post update
Lazio 2-2 Dynamo Kiev
Ciro Immobile has scored six goals in as many Europa League games for Lazio. He's scored 33 in 35 in all competitions this season.
GOAL - Lazio 2-2 Dynamo Kiev
Junior Moraes (79 mins)
An excellent Junior Moraes goal levels it up for Dynamo Kiev in Rome - their second away goal.
He gets the ball on the edge of the box, turns and his 20-yard shot swerves past Lazio keeper Thomas Strakosha.
GOAL - RB Leipzig 2-0 Zenit St Petersburg
Timo Werner (77 mins)
Liverpool-bound Naby Keita plays a ball through to Germany striker Timo Werner, who just lifts the ball over keeper Andrei Lunev.
Post update
AC Milan 0-2 Arsenal
Since the start of the 2015-16 campaign, Henrikh Mkhitaryan has been directly involved in more goals than any other midfielder in the Europa League (15 - nine goals and six assists).
Post update
Lazio 2-1 Dynamo Kiev
Each of Felipe Anderson's last seven goals have been scored at home.
SUBSTITUTION
Marseille 3-1 Athletic Bilbao
Marseille star Florian Thauvin goes off on a stretcher with what looked an innocuous-looking injury. Clinton N'Jie replaces him.
GOAL - Lazio 2-1 Dynamo Kiev
Felipe Anderson (62 mins)
Lazio go ahead, only 10 minutes after falling behind. Felipe Anderson converts Sergej Milinkovic-Savic's pass
GOAL - Marseille 3-1 Athletic Bilbao
Lucas Ocampos (57 mins)
Marseille reestablish a two-goal lead and it's Lucas Ocampos' second. Dimitri Payet crosses from the right and it bounces its way across to Ocampos. He takes a first-time shot which squirms past Athletic keeper Iago Herrerin at his near post.
Post update
AC Milan 0-2 Arsenal
Arsenal midfielder Mesut Ozil has been directly involved in 100 goals in 189 appearances for Arsenal (37 goals and 63 assists).
GOAL - RB Leipzig 1-0 Zenit St Petersburg
Bruma (56 mins)
RB Leipzig have been knocking on the door all game and they deservedly lead. Bruma picks up the ball in the box before just guiding one past the keeper.
GOAL - Lazio 1-1 Dynamo Kiev
Ciro Immobile (54 mins)
... but it doesn't last long as Ciro Immobile bags his 33rd goal of the season to cap off a good team passing move.