Arsenal v Manchester United: Five Key Battles That Will Decide Saturday’s Game

4) Tyler Blackett v Theo Walcott

Walcott is unlikely to start, but Wenger will almost certainly bring him on later in the game as United start to tire. If Luke Shaw isn’t fit then United may use Tyler Blackett at left-back, and the out-of-position youngster will be seriously vulnerab;e to Walcott’s pace and directness down Arsenal’s right.