Kevin Nugent couldn't hide his disappointment after watching his Millwall Under 23s side lose 3-2 to 10-man Colchester United on Friday afternoon.
Goals from George Walker and Sean O'Brien turned a 1-0 deficit on its head in the second-half, but following a red card for the visitors, The U's managed to turn the game around once more, scoring the winner two minutes from time.
"To say I'm disappointed is an understatement," Nugent told millwallfc.co.uk. "To go 2-1 up against 10 men and then lose 3-2 is poor.
"The goals are terrible - it was a poor penalty to give away, then the other two were from long kicks down the field, which our centre-halves don't deal with, and the ball ends up in the back of the net.
"There was a shout for a penalty of our own before their second goal, but that doesn't excuse defending like that. That's how we've been this season, inconsistent. The lads that stay with us next season have got to improve."
Next up - and last up - for The Lions is the visit of Sheffield Wednesday to The Den on Tuesday afternoon.
"We've been up and down all season - we've kept things really tight in games, but then also let ourselves down today by conceding three goals. That's where we are at the moment."