By Manchester correspondent Alex Stevens 

Sergio Aguero will be sidelined for four to six weeks after suffering the latest in a series of hamstring injuries.

The Manchester City star tore his left hamstring while chasing a long ball downfield during Argentina’s 2-0 defeat to Ecuador on Thursday night.

Aguero admitted afterwards that he expects to be ruled out for a month with what is a Grade Two hamstring injury.

The player has not yet returned to Manchester to begin treatment but club medics fear he could be sidelined for between four and six weeks.

This will rule City’s No1 striker out until at least mid November, and possibly even until December.

It is a shattering blow for Manuel Pellegrini, who could be without the 27-year-old for eight fixtures, including the Manchester derby, home-and-away Champions League clashes against Seville and the home match against Liverpool on 21 November.

Aguero scored five goals in City’s 6-1 annihilation of Newcastle a week ago before being substituted at the 66-minute mark. In total, he has netted eight times in 11 matches for the club this season.

After leaving the field on a stretcher, Aguero told reporters in his home country on Friday: “I think I’ll be a month without playing.”

City fear his absence could be even longer given the centre-forward’s troubled recent past with injuries.

The striker was reported to have been in tears in the dressing room after the game and was immediately released from international duty.

The Aguero latest hamstring problems come as City try and manage skipper Vincent Kompany’s injury problems.