However Di Maria now faces a battle to prove his fitness to Emery for a match PSG can not afford to lose if they are to top their Champions League group .
Di Maria joined his team - mates on the Emirates pitch for a pre-match training session .
However Di Maria , who joined his team - mates on the Emirates pitch for a pre-match training session , now faces a battle to prove his fitness to Emery for a match PSG can not afford to lose if they are to top their Champions League group .