Former Italy champions Milan are monitoring a number of players to improve on their disappointing Serie A finish this season.
Porto's Jackson Martinez is one of the many targets of the Rossoneri although chairman Jorge Nuno Pinto da Costa is determined to keep the strong striker at the club at least for one more season.
Tottenham Hotspur and Arsenal are also interested.
Mauricio Pochettino will lose Roberto Soldado and Emmanuel Adebayor this summer with Erik Lamela also set to exit White Hart Lane.
Valencia are also keen on the 28-year-old as they will try to qualify for next season's Champions League through the play-off round.
The Colombian is available for £24.7m, a fee that Milan are unlikely to offer.