Manchester City boss Manuel Pellegrini says striker Sergio Aguero will miss at least seven games for the club after suffering a muscle injury.
The 27-year-old is expected to be back for the November 21 match at home against Liverpool.
The Chilean hopes to have defender Aleksandar Kolarov and midfielder David Silva back before the end of the month.
"Sergio has a muscle injury – it's an important injury so I don't think he will be back before one month," Pellegrini told reporters.
"Silva has a kick in his ankle – he's also out. Delph and Clichy continue to recover with old injuries. Kolarov also has a hamstring injury.
"We'll see how they [Aleksandar and David] improve in the next week – I hope both of them can be back in 15 days.
"Yaya and Samir are both recovered - Fernando had a small problem in his knee but he's recovered.
"Delph maybe one week more he will be working with the squad."