Parlour fears Arsenal will continue to struggle unless Wenger gets rid of the 'dead wood' next month and freshens up his squad.
"It's going to be so important this January window," the former Gunners star told talkSPORT.
"The performance the other night wasn't good enough. You go to a place like Bradford and you have got to be on your game. Every single player has got to go out there like they are playing Manchester United.
"They have got so many players who are on about seventy-five thousand pounds a week. They need to get them out. Sometimes they bring players down if their attitudes are not right in training.
"Arsene Wenger has to look at his players and really up the quality because he has lost some unbelievable players in the last few years."