Roberto Martinez accused his Wigan Athletic players of falling below the required standard after they were dumped out of the Carling Cup by Blackpool.
The Latics were soundly beaten 4-1 by the Championship club in the second round on Wednesday night and afterwards Martinez was scathing in his criticism.
Martinez had made nine changes to side thrashed 5-0 by Manchester United at the weekend.
"There are certain standards that are not acceptable in our club and the players should know that," said the Spaniard.
"As a professional footballer you need to be ready for the chance when it comes along.
"We can learn a lot from this defeat. Those who have not been involved in the league games were given an opportunity tonight, but it was not good enough.
"Certain players did not perform and it is clear this is not what we expected.
"Overall as a team and as individuals, we handed the game to Blackpool. They did not have to work hard for their goals and it is very disappointing.
"We were never in contention to win and now we are out of the League Cup, which I am upset about."