IAN Holloway believes the right blend of youth and experience in Derby's squad is fuelling their charge for automatic promotion.
The Rams have soared up to third in the Championship table since the appointment of Steve McClaren in September, winning 15 of their last 24 games.
And Holloway reckons the secret to their success is a balanced dressing room.
He said: "Derby are very, very impressive. They have got a fantastic energy in their group and some wonderful players coming through.
"I'd suggest they have got the balance right between youth and experience, whereas we have too many senior players.
"So far, our season has entailed the fact that we have had far too many players, a change of management, a change of staff and now we've got to dig ourselves out of the mire."
Despite Millwall's lowly league position, Holloway insists his squad is approaching Saturday's trip to the iPro Stadium with a positive mindset.
He said: "I want to change the atmosphere around The Den and at the training ground, and I believe we're doing that.
"We've got to bounce, fight and come back and that's what we're all about.
"When the game finished against Brighton last weekend, I don't think the fans were that disappointed – they clapped the lads off and were fantastic with us.
"I cannot fault the lads' work rate. Only that second half at Barnsley went slightly wrong, and the final ten minutes of the Reading game flattered them like you wouldn't believe.
"Some people will write us off at Derby but the players and I believe we can get a result. If we weren't thinking positively, we'd have already lost."