Danny Fox said Nottingham Forest need to manage games better as The Reds suffered defeat in the East Midlands derby.
Goals from Matej Vydra and David Nugent condemned Forest to defeat at Pride Park and Fox believes the side needed to be smarter in how they manage the contest.
He said: "Any game isn't nice to lose but to lose to Derby is bitterly disappointing. For the fans, for the manager, for the lads and for everyone at the club.
"We created chances and Jason had a great chance just before they scored the second and if that goes in the game goes a totally different way.
"In the first half I thought we were the better side, bar their goal. Jordan hasn't had a lot to do bar pick the ball out of the net and take a few goal kicks. It was a sucker punch, the first goal, but I thought we reacted really well. Barrie has a great chance to make it 1-1 before the break and if it was a different scoreline at half time their crowd could have turned on them.
"We dominated the game and it is frustrating saying that as in the end, nobody cares. If you look in the newspaper or on the tele later on all you will see is the score. Three points is the most important and for all our good play, we need to be more ruthless.
"We are all disappointed. We can't say we played well as we didn't win the game and three points were the most important thing. We need to be a bit cleverer and manage games a bit better."