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Ralf Rangnick reaffirmed his faith in Manchester United's medical department and insisted he could not select a player who felt unable to play after the high-profile absence of Cristiano Ronaldo in Sunday's defeat at Manchester City.

Rangnick confirmed Ronaldo, who did not travel with the United squad to the Etihad Stadium, was ruled out of the 187th Manchester derby with an injury to his hip flexor.

Sky Sports pundit Roy Keane questioned the veracity of Ronaldo's injury before kick-off, saying: "We talk about Ronaldo being a machine and very rarely getting injured… it doesn't add up to me."

Ronaldo's sister, Katia Aveiro, also appeared to question the 37-year-old's absence before the match by liking an Instagram post claiming he is not injured and was dropped by Rangnick.

Speaking after the United's chastening 4-1 defeat to City, Rangnick responded to Keane's claims.