Marouane Fellaini has admitted that there has been a big step up in class since his summer move to Manchester United from Everton.
The Belgium international made the switch from the Blues to the champions for around £28m on transfer deadline day, and revealed that the standard at United is superior to what he had previously been used to.
"The quality [of the training] is better than at Everton," Fellaini is quoted as saying in The Metro.
"I have a problem with the intensity of the training because I am playing with big players.
"It is quicker than it is with Everton."
Fellaini made his Champions League debut with David Moyes's side as they brushed aside Bundesliga outfit Bayer Leverkusen 4-2 at Old Trafford on Tuesday evening.