Mourinho insists when he first arrived at Chelsea the culture was very different compared to today.
"One of the most difficult things in the club is to create a victory culture.
"A place where you walk through the door and you smell the success, you smell confidence, you smell self-esteem. Where you arrive and think: 'This is a big club'.
"David is now in a big club and that is a big help. Everybody there already knows how to win. And that's a big help. It's a big club with a big winning culture and that is very important."