Arsenal manager Mikel Arteta has explained his reasons for taking off Thomas Partey against Olympiacos.
The Gunners had to battle against the Greek side away from home in the Europa League round of 16 first leg.
However, they emerged with a 3-1 away win ahead of next week's second leg.
Partey came off in the game, and Arteta explained his reasons for subbing the central midfielder.
He told reporters: "Because I wanted to change him and bring somebody else in to try to find some other stuff and try to change the shape with the way we were playing inside."
