Arsenal manager Arsene Wenger says managers must be "careful" when criticizing their own players and control what they say.
Arsenal play Manchester United at 3am tomorrow in a battle for the English Premier League's top four places.
United’s manager, Jose Mourinho has questioned the desire of defenders Luke Shaw, Chris Smalling and Phil Jones to return from injury.
Wenger says managers can do that in extreme situations but it has to be handled carefully.
