Leroy Sane is set to undergo surgery on his torn anterior cruciate ligament injury in Austria.
Germany winger Sane – strongly linked with a move to Bayern Munich before the Premier League's transfer window closed – sustained the injury during the Community Shield defeat of Liverpool on August 4.
The 23-year-old is expected to be out for up to seven months, leaving City without the Germany international for the majority of the 2019-20 campaign.
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Sane was expected to have undergone surgery already, though Pep Guardiola told reporters ahead of City's clash with Tottenham: "I think [the operation] is this weekend.