Manchester United's Alexis Sanchez starts against former club as Arsene Wenger rings changes for Arsenal
Arsene Wenger handed young defender Konstantinos Mavropanos his Arsenal debut as Henrikh Mkhitaryan came into a much-changed side at former club Manchester United.
David Ospina, Hector Bellerin and Granit Xhaka - the skipper at Old Trafford - were the only players to retain their starting role after Thursday's Europa League semi-final first-leg 1-1 draw with Atletico Madrid.
Victor Lindelof replaced Phil Jones in United's only change to the side that beat Tottenham in last week's FA Cup semi-final. Alexis Sanchez stars against his former club.