Manchester City are close to signing Serbia defender Matija Nastasic from Fiorentina for about ?12m.
The 19-year-old has been a long-time target of City manager Roberto Mancini.
Defender Stefan Savic is expected to move in the opposite direction as Mancini looks to add reinforcements to his Premier League-winning squad.
Striker Roque Santa Cruz, 31, could also leave before Friday?s transfer deadline, with Malaga and Real Betis keen on a loan deal.
Santa Cruz has barely figured since being signed by Mark Hughes from Blackburn Rovers for ?18m in 2009.