Cristiano Ronaldo is expected to leave Manchester United in January (Photos: Getty)

William Gallas believes Erik ten Hag treated Cristiano Ronaldo “contemptuously” and advised Chelsea to sign the runaway Manchester United striker in January.

Ronaldo will leave Old Trafford in January after leaving United in an extraordinary interview with Piers Morgan.

In the lengthy interview, Ronaldo said he disrespects current Red Devils manager Ten Hag, claiming that United have not “developed” since Sir Alex Ferguson retired.

Ronaldo has been widely condemned for his comments, but Gallas is at least sympathetic to the striker, claiming Ten Hag has treated him “contemptuously” this season.

The former Premier League defender also says he would not be “surprised” if Chelsea made an attempt to sign Ronaldo in January.

New Chelsea owner Todd Boehly considered moving for the Portuguese legend last summer and could decide to rekindle his interest if he gets the backing of Blues boss Graham Potter.

“I think Cristiano Ronaldo will leave Manchester United after the World Cup,” Gallas told Genting Casino. I wouldn’t be surprised if he goes to Chelsea.

Erik ten Hag is now ready to fire Ronaldo (Photo: Getty)

“He was honest and spoke from the heart and I think everyone is a bit surprised by what has happened to him at United this season.

“The only people who know what has been said about his role and importance in the team are him and the manager.

“If you look at what Erik ten Hag did to him by putting him on the bench, it’s hard for a player of Ronaldo’s stature to understand, but he accepted it.

“If Ten Hag asks a player like Ronaldo to come off the bench in the last two or three minutes, he shows a lack of respect. It would be better to give those minutes to younger players. Ten Hag must respect what Ronaldo has done throughout his career.