He spoke after seeing his side crushed by an innings and 36 runs inside three days against Nottinghamshire.
“It was a very disappointing game for us,” he said. “We’re playing really poor cricket at the moment. Our bowlers were the bright sparks for us again and our catching was excellent but we batted poorly and you can’t compete in this game if you can’t put a score on the board.
“The ball was swinging a bit but if you can’t play a swinging ball you shouldn’t be playing at this level. We’ve got out cheaply twice, we haven’t even got an individual fifty within the game and we were no competition for the opposition.
Our batting has been poor all season and I can’t put a finger on why. It’s just one of those rolls you get on and the confidence goes. They are going out there almost looking for a good ball and they are getting it.
Nottinghamshire had been all out for 307 in reply to Derbyshire’s first-innings 149, seamer Fynn Hudson-Prentice finishing with career-best figures of five for 68.