Chelsea head coach Mauricio Pochettino's notoriously grueling training regimes could be a problem at the club.
The Argentine, who previously coached Tottenham and Paris Saint-Germain, is known for demanding a lot from his players.
After a 1-0 loss to Aston Villa at home, former Tottenham star Aaron Lennon pointed to issues at the club.
He told Stadium Astro: "That's the last thing you need [negativity around the club].
When you're not getting results on the pitch, and then things are coming out from inside the dressing room [unhappy players], it makes it all a little bit of a circus.
"It's a bit like Man United at the minute, it's just story after story, and that's when, normally, things are not going well and players are unhappy. If you do look at the injury list, I actually looked at it and thought [about] Pochettino's training methods.
"He does change the training routine. He did it when he came to Spurs. Some of our players, we did struggle at the beginning because it was a completely different load and maybe that is playing a part."