The German defender recently claimed that he and his teammates need to put a bigger shift in on the training field in order to improve in games.
"I don't know what he meant by that, but you have to be careful with statements after the game," Wenger told reporters. "I think we train very hard, the attitude is right and the spirit is there.
"Until now we have been relatively consistent in our attitude but not efficient enough offensively or defensively."
Tomorrow, Arsenal will face Sunderland at the Stadium of Light.