Coyne joined the U's from Luton in January (Getty)
Defender Chris Coyne admitted Colchester's second-half capitulation against Coventry was unacceptable.
The U's conceded five goals in the second half at Layer Road, having held a 1-0 lead at the break.
The 29-year-old told BBC Essex: "I'm very disappointed at the performance of the lads in the second half.
"We've got a point to prove and that's not the sort of reflection we want people to take of this group of players because we're a lot better than that."
"We're all disappointed with each other. Heads are down but we'll have to pick ourselves up for a big game against Stoke next week."
Football kicks you when you're down and then it treads on you
Chris Coyne
Saturday's match with the Championship's second-placed side will be the last to be played at Layer Road.
The Australian-born centre-half believes his struggling side can bounce back in time for the game.
He said: "Football kicks you when you're down and then it treads on you, so we've got to be a strong group, train hard during the week and make sure we come out and give a good account of ourselves against Stoke.
"It's only fair that we do that for the other teams that are also pushing for that promotion to the Premiership."
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