He has also opened the door for former captain John Terry to return to Stamford Bridge as part of his coaching staff.
"I think they should loan us him and I could help him as well", said Warnock. Obviously, in your first season in a new club it's always hard and I wasn't expecting him to leave, but AC Milan are getting a great player.
'The only thing I can think of (as to why the move didn't happen) is that our deadline was two or three weeks earlier and (Chelsea) might have been thinking of using him in their own squad.
John Terry spent last season playing for Steve Bruce at Aston Villa, and, amid rumours that the Birmingham club would happily welcome the former England captain back into the fold, Terry must now decide whether he is ready to call time on his playing career for the goal of rejoining Chelsea.
Sarri has made a superb start to life in the Premier League, with Chelsea claiming four wins from four, however their momentum was halted by the first worldwide break of the season.
The Spaniard will be rested following his global retirement, and appears one of the most likely City players to start in Kevin De Bruyne's absence. At the moment he is able to be on the bench.
"It's very hard. The gap last season was 30 points (between fifth-place Chelsea's 70 and City's 100) so to go above 30 points in one season is very, very hard". Mentally after the break it is hard.
Bringing the best from Pedro, Marcos Alonso and, of course, his former Napoli star Jorginho, Sarri has very few injury worries in the build up to this game. "My feeling is that we are not a very solid team in the defensive phase, we need to improve and we can, my feeling during the training is that this team can improve". "It will be a very hard game for everybody who plays Cardiff".
"If we want to take the points, we will need a very good performance tomorrow".