The former Blues assistant cannot wrap his head around some decisions made at his old club, especially selling the Serbian to a title rival
Former Chelsea assistant Ray Wilkins has slammed some of the Blues' recent transfer dealings, particularly the club's sale of Nemanja Matic to Manchester United.
Matic was reunited with former Chelsea boss Jose Mourinho at Old Trafford in the off-season, and has made a strong start to life with the Red Devils.
"The selling of Matic to Manchester United as far as I’m concerned was an absolute disgrace, because that should never have happened," Wilkins said on BBC Radio 5 Live.