Despite signing Cristian Zapata on a permanent basis earlier this year, Milan is still in need of a new centre-back.
With Mario Yepes' contract expiring and Cristian Zaccardo not expected to be back at the San Siro for next season, the Rossoneri are very thin at the centre-back position.
Massimiliano Allegri has just four centre-halves to choose from should the position fail to be addressed in the transfer window, and they include Philippe Mexes, the aforementioned Zapata, Daniele Bonera and Bartosz Salamon.
Bonera is 32 and little more than a bit part player, Mexes can struggle with consistency at times and Salamon hasn't made an appearance for Allegri's side since joining in January.
Zapata's pace makes him an asset to the first team, and if one were to project Milan's starting central-defensive pairing for next season, it would include Zapata and Mexes, who had a solid season last term.
Milan has adopted a transfer policy of attempting to buy young and talented players, develop them and eventually integrate them into the first-team.
The four players on this list are all 22 and under and have shown the potential to develop into very good centre-backs. Kurt Zouma, Eliaquim Mangala and Kyriakos Papadopoulos, just to name a few, have been left out because their transfer fees would likely rise so high that it wouldn't be feasible for Milan to target them.
Most of the following players have not been formally linked with a move to the San Siro outfit, so this is speculation, but all look to be burgeoning stars and therefore should be targeted.
Let's take a look at four centre-backs Milan could target to shore up their back line for next season.