Chris Morgan insists Tuesday's U21s defeat at Huddersfield Town must act as a learning curve to his young squad.
Morgan acknowledged his side's abject display and outlined several areas which culminated in the disappointing 4-1 reversal:
"It was a disappointing performance; we didn't defend properly from set-pieces and made several elementary mistakes which must be addressed.
"What I hammered home to the lads afterwards is football isn't just about what you do when you have got the ball, your work out of possession is just as important, arguably more important when under pressure and we simply didn't do enough.
"I expect certain things to be done as mandatory, but we didn't heed the warning signs early on and ultimately we have conceded the first three goals from set-pieces, which is unacceptable.
"We got into the game in the second-half but conceded from a really soft free-kick, again we didn't react and set the wall up properly.
"Richard Cresswell was at the game in his new role and Ian Bennett played for them. Afterwards I used both as an example to our boys of what is needed to succeed as a professional.
"They have both enjoyed excellent careers and that is not just down to their ability but more to their commitment and professionalism both on and off the field and our lads need to acknowledge and replicate aspects of that to aid their development."