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Ralf Rangnick has rubbished Roy Keane's claim that Cristiano Ronaldo's injury that ruled him out of the Manchester derby "doesn't add up."

The Portugal star was missing from Manchester United's damaging 4-1 defeat by Pep Guardiola's men due to a hip problem.

Rangnick provided an update on Ronaldo's condition before kick-off revealing he couldn't train on Friday and wasn't able to travel with the squad to the Etihad, as a result.

He said: "Cristiano (Ronaldo) had some problems with his hip flexor on Friday and since then, he didn't train."

Anthony Elanga came into the side to face Manchester City instead but Keane was not convinced with Ronaldo's diagnosis given the fact "the man is a machine who is rarely injured."

He told Sky Sports: "The surprise is Ronaldo with the problem with his hip flexor, but United have a bit of pace they still have to come out and play with pride and quality.

"Elanga is a good player, positive and is an intelligent player.

"There seems to be something more with the Ronaldo situation, the manager coming out talking about something about his hip flexor but the man is a machine and is rarely injured, but every now and again he comes out with that about his hip flexor, doesn’t add up to me."

But Rangnick has dismissed any notion of illegitimacy over Ronaldo's injury as he directly responded to the former