The Argentine striker is out of contract in the summer, as his manager Guardiola.
While the 32-year-old Aguero would like to stay, it is unclear if City will offer him fresh terms.
He may still be a prolific striker, but his injury history has concerned the club.
"I don't know, I don't want to talk about it because I am not involved with this," Guardiola told a pre-match press conference.
"If I should be involved in contracts, maybe the day should be 48 hours, not 24! What I want is for Sergio to be fit, what I want is Sergio [to] come back again, be ready as much as possible.
"We miss him a lot. What he has done for this club is outstanding, [he] will be a legend of this club, we want to enjoy him before but it depends on his physicality and his physical condition."