City have strengthened their squad this summer with the additions of Malaga goalkeeper Willy Caballero, Arsenal right back Bacary Sagna and Porto midfielder Fernando, but having already felt the wrath of the Financial Fair Play regulations, Manuel Pellegrini must also start selling some players.
Midfielder Jack Rodwell joined Sunderland earlier this week in a £10m deal, and now Serbian international Nastasic has reportedly been put up for sale. The former Fiorentina man has slipped behind Vincent Kompany and Martin Demichelis in the City pecking order, and with the club also looking to bring in Porto's Eliaquim Mangala, Nastasic's development would be severely stunted by not playing next season.
Juventus have been linked with offering Nastasic a return to Serie A, but Arsenal have also been tipped to make a £16m offer for the 21-year-old - and if that's true, then they must continue to pursue a deal.
The Gunners have an established centre back pairing in Laurent Koscielny and Per Mertesacker, but both could be upgraded upon in time, whilst the club also look set to lose Belgian international Thomas Vermaelen this summer. The 28-year-old has attracted interest from Premier League rivals Manchester United, whilst Barcelona reportedly made a £10m bid for the former Ajax star on Tuesday night.
The long-running story has been that Gunners boss Arsene Wenger doesn't want to let Vermaelen leave until he has a replacement centre back in place. Very few centre backs have actually been linked with Arsenal since that line came out, which could mean Nastasic is near the top of Arsenal's transfer wish list.
Nastasic has plenty of potential, and has already shown that he has a great reading of the game for his age, whilst he's technically and athletically gifted enough to make it to the very top of the game. Given time to develop behind Koscielny and Mertesacker, Nastasic could be a star - but they must ensure that he gets first-team football too.