The Serbia international has signed a five-and-a-half-year contract at Stamford Bridge.

The 25-year-old told the Blues’ official website: “I am very happy for this opportunity to be back at this club.

“I feel very good because of that and just want to say I will give my best to help the team and make the Chelsea fans happy.”

Manager Jose Mourinho welcomed Matic back for his second stint at the club.

He said: “I am very pleased that Nemanja is returning to Chelsea. He has grown as a player in Portugal and has become a fantastic all-round midfielder.

“I am sure he will become a very important member of the squad and help us to achieve our ambitions.”