Kyle Walker's availability for the World Cup is up in the air after Manchester City manager Pep Guardiola declared the England right-back suffered an abdominal injury that will keep him out "for a while".

Walker, 32, was substituted in the first half of City's 6-3 derby win against Manchester United on Sunday after making his seventh start from his side's eight Premier League fixtures this campaign.

He also started four of England's six UEFA Nations League games since the beginning of June, resulting in three defeats and a draw.

However, Walker is now set for "weeks" on the sidelines in the shadows of the World Cup, according to Guardiola.

"[He will be out] for a while," he told reporters following City's 5-0 Champions League thrashing of Copenhagen on Wednesday. "I don't know exactly, but weeks.

"Something abdominal, so he will be a while. We don't know how long. Maybe the club will make a statement in the next day, but for a while he will be out.

"I don't know [about availability for the World Cup]. I cannot say anything else, I don't know."