Jose Mourinho says Henrikh Mkhitaryan "needs to do more" if he is going to be a success at Manchester United.
A difficult week for the boss was compounded as United wilted at the imposing Sukru Saracoglu Stadium, where Moussa Sow scored a sensational overhead kick and Jeremain Lens an outstanding second-half free-kick as Fenerbahce claimed a 2-1 win.
Wayne Rooney's superb late goal was merely a consolation and Mourinho said the loss was deserved, accusing his players of approaching the match like a "summer friendly".
Mkhitaryan was not guilty of that lax start given he was a 61st-minute introduction, but his manager expects more from a player who has struggled to make an impact since his big-money summer move.