Manchester United manager Jose Mourinho has accused his players of approaching the loss to Fenerbahce as if it was a "summer friendly".
The Red Devils dropped to third in Group A of the Europa League following a 2-1 defeat in Istanbul.
United have now won just two of their last seven games in all competitions.
"A team that concedes after two minutes is a team that is not ready, not mentally prepared, not focused, not concentrated," said Mourinho.
Champions League final v summer friendly
United have scored just two goals in their last four games, while conceding after just 30 seconds against Chelsea and 65 seconds against Fenerbahce.