He got injured on Saturday and will miss, as a minimum, the Champions League match this week. But this could be the tip of the iceberg. Agüero could be out for a month.
Guardiola confirmed it in the pre-match press conference for the Marseille match. "Agüero will be between two weeks and a month out. We don't know exactly, it depends on how the muscle recovers", the Spanish manager explained.
"We try to take care of the return of Agüero in the best possible way, but after a knee injury there is always a risk of muscle damage. And this was the case with Sergio", he added.
"The only thing I want from Agüero is for him to be well. No injuries. We need him, what he has done in this club is incredible", he also said about the Argentinean, who is not being respected by injuries in his maturity.