City's star striker played only the final 27 minutes of Monday's season-opening 3-0 Barclays Premier League win at West Brom on Monday.
As he did last year, manager Manuel Pellegrini is easing the 27-year-old back into action after international duty during the summer
Aguero was a substitute for the first two matches last season but went on to score 32 goals in 41 appearances.
The Argentina forward told the club's website, www.mcfc.co.uk: "Whether I start or not remains to be seen
I'm trying to get there and be in top condition, but arriving for pre-season later having taken part in the Copa America with Argentina means I need some additional time.
"With the whole season in mind, what matters the most is that I get in top form and don't take any risks."
Source : PA
Source: PA