Manuel Pellegrini's side has beaten away competition for the striker's signature from Manchester United, Chelsea and Arsenal.
Manchester City has tied up a deal to sign 18-year-old striker Enes Unal from Bursaspor.
The striker has only scored four goals in 35 league games for the Super Lig side but is seen as his country's most exciting young talent - with an astonishing record of 170 goals in 102 games for youth teams - and has already represented Turkey at senior level.
Goal understands that Unal had offers from Arsenal, Chelsea and Manchester United as he entered the final year of his contract but opted for City, with Bursaspor president Recep Bolukbasi confirming the agreement on Thursday.