The trio will now go before the public vote to determine who is the first winner of the Etihad prize this season.
Aguero has scored five goals in four matches to date.
His double against Chelsea secured the Community Shield and his treble against Huddersfield Town ensured the Blues got off to a flying start on home turf.
He has also struck the woodwork on three occasions already this campaign including two against Wolves last weekend.
Bernardo Silva has impressed in all the games he's played so far and it was his crucial goal against Arsenal that sealed three points for City at the Emirates.
It was a stunning effort from the Portuguese play-maker who has shouldered added creative responsibility with the long term loss of Kevin De Bruyne.
Mendy is our third nominee.
The former Monaco defender has already created three goals for his team-mates this season and been involved in two other goals for the Blues.
His drive and energy in the opening weeks has reminded everyone how much of a loss he was last season - can he land a first Etihad award?