Chris Powell admitted James Vaughan had “let himself down” after the striker’s injury-time red card marred Huddersfield’s gritty goalless draw at Ipswich.
Vaughan, back in the squad after a calf injury, was shown a straight red card after throwing the ball in the face of Ipswich left-back Jonas Knudsen following an altercation over a throw-in.
The sending-off soured Huddersfield’s first clean sheet of the season in a drab match which saw both sides cancel each other out.
Powell said: “The sending-off put a dark cloud on a decent day. It was a good performance, we kept a clean sheet and created chances. But he (Vaughan) has let himself down.
“He has worked hard to get back into the squad and he was actually close to starting. But with two or three minutes to go, he has to manage the situation and not get involved.
“He has come in and apologised to me and the group but we are now going to lose him again - and we will miss him. He will have to work hard to get back into the squad.”
Huddersfield had the best of the first half, with Ishmael Miller a particular threat.
The powerhouse striker twice got the better of Tommy Smith without testing Town keeper Dean Gerken from good positions before the visitors went even closer on the half-hour mark.
Miller’s flick released Nahki Wells and while he squeezed the ball over the advancing Dean Gerken, Christophe Berra was on hand to clear off the line.
Ipswich improved, with Freddie Sears testing Terriers keeper Jed Steer from 25 yards before Jonathan Douglas headed just over.
At the other end, Gerken made a great save to keep out Emyr Huws’ shot which came through a crowd of bodies before Steer blocked David McGoldrick’s snap-shot from 10 yards out as the game went into injury time.
The final piece of action saw Vaughan shown a straight red card following his altercation with Knudsen.
Ipswich boss Mick McCarthy said: “I think it was a game of two halves. We were quite good in the second half and not so good in the first half.
“Both keepers made great saves so I think a draw was probably the right result. It was good to get a clean sheet and our reaction in the second half was positive.
“We were back to being our competitive best by not allowing them to play and I think we won our personal battles in the end. On a different day, we would have won 1-0 but that is not quite happening for us at the minute.”