Nottingham Forest defender Jack Hobbs says the squad have 'higher levels to reach' ahead of Sunday's game against near-neighbours Derby County.
The Reds go into the clash sitting at the summit of the Sky Bet Championship but Hobbs believes he and his teammates have not yet reached their potential despite having recorded six wins from seven matches in all competitions so far this season.
He told Forest Player: "As a squad we feel like we haven't played to the standard that we want to yet and we think we've got higher levels to reach. The type of players that aren't even making the matchday squad shows just how strong we are at the moment.
"Competition for places is high in the squad but that is a good thing because it helps develop a winning mentality. A lot of the injured lads are coming back now and that will only help to improve our chances.
"The atmosphere at the training ground is excellent. Everyone is positive, dying to succeed and wanting to do well. Ultimately though we get judged on results and although it has gone well so far, we want to strengthen our position on Sunday."
He said: "It is right up there amongst the big matches I've played in. The atmosphere was unbelievable, a sell-out crowd and it was a great occasion to be a part of. I've never experienced anything like it and I'm sure it will be the same again on Sunday.
"We felt like we let a lot of people down at their place last season but it isn't about revenge as such. Of course we want to put it right but the main thing is to take three points and keep our place at the top of the table."