John Stones: Injured defender will prove to be a 'big loss' for Manchester City, says Pep Guardiola

John Stones
John Stones only returned to action on 8 October

John Stones' injury in the Champions League victory over Young Boys will be a "big loss" for Manchester City, says manager Pep Guardiola.

The versatile England defender, 29, was replaced by Nathan Ake at half-time, with Guardiola telling TNT Sports "I feel so sorry for him".

"He is so important for what he does," added Guardiola.

Stones missed the start of the season with a hip injury and only returned to action in October.

When asked if he expects Stones to be kept out for a while, City's Spanish boss added: "I think so. [It is a] muscular injury, it will be a while.

"It is a pity, it is bad news for us. I don't know how long."