Nottingham Forest head coach Philippe Montanier says his side need to work exceptionally hard on the training ground to put right the mistakes from the 3-0 defeat at Brighton.
The Reds fell to their first defeat of the campaign at the Amex Stadium and Montanier insists his side will have to work harder than ever to cut out the defensive errors which have plagued their season so far.
He said: "It is a great disappointment for us but I think Brighton deserved their victory. It is incredible that we didn't score because we had so many opportunities in the first 30 minutes but afterwards it was a tough night for us.
"We made many mistakes all over the field and it has to be a good lesson for us. We've had a bad day all round. We lost Matt Mills and Britt Assombalonga to injury this morning and then Thomas Lam in the warm-up. But they're not excuses for the performance tonight.
"After going 2-0 down, we tried to do things individually rather than as a team and by then it was too much to get back. Our performance for the first 30 minutes was good but we have to play better for the full 90.
"We cannot keep conceding three goals and expect to get something from the game. We need to concentrate more and work harder on the training ground to put these mistakes right and that is what we will do."
Montanier was left without the services of Britt Assombalonga, Matt Mills and Thomas Lam before kick-off and despite rumours regarding the former's future at the club, the head coach is confident of keeping him at The City Ground.
He said: "For the moment I am more concerned about fixing the mistakes from this defeat rather than speculation. I'm confident that Britt will be back for the game on Tuesday night and I'm not worried about him leaving the football club.
"Britt felt a pain before tonight's game and we didn't want to take any risks with him with so many games coming up. We're hopeful of having him and Matt Mills back for the Brentford game but there's much work to do before then."