According to a statement from Manchester United, they have begun appropriate steps in the wake of the interview with the Portuguese star.
According to sources, United have hired lawyers to look into the possibility of filing a lawsuit.
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After the World Cup, Ten Hag told the club bosses that he doesn't want the Portugal international to return to United's training base.
A club statement issued by United on Friday read: "Manchester United has this morning initiated appropriate steps in response to the recent media interview by CR7" We will not make any further comments until the process is over.
According to sources, United have been taking legal advice since Monday morning because of the leaked interview with Piers Morgan.
The club was incensed by the claim that they have made zero progress since Sir Alex Ferguson retired.
He said Ten Hag "provoked" him into refusing to appear as a substitute against Spurs, leading to his suspension.
The rest of the squad is due to arrive in Qatar at 11pm local time on Friday, with the exception ofRonaldo. The World Cup kicks off with a game between Portugal andGhana.
According to sources, United are hoping to finish their action against him quickly.