Coventry City U21's boss Darren Murray said that he was not happy with his side's first half performance at Colchester United.
The Sky Blues went two goals down early in the game at Florence Park in Tiptree yesterday but were rescued by a brace from Shaun Millar.
"The way we started the game was not acceptable and it must not happen again," Murray said to Keiran Crowley.
"I said after the Swansea game that the first-half performance wasn't acceptable but I've just seen a worse first-half than that.
"It wasn't what we want to see and we expect much more from Coventry City. If you don't do your jobs properly in the game, then performances like that happen. I wasn't happy at the break and I made sure they knew that."