With 12 goals from 19 Ligue 1 appearances to his name, Dia has attracted significant interest from several clubs during the ongoing transfer window.
West Ham are on the lookout for a new striker following the sale of Sebastien Haller to Ajax and have identified the Senegal international as a potential candidate.
The Irons even made an offer to acquire his services from Reims, but saw the bid turned down, with the French outfit not willing to sell the player for anything below €15m, a sum David Moyes’ side deem too high.
According to French magazine France Football, West Ham will continue to track Dia but now face competition from three clubs in Italy.
Serie A sides AC Milan, Napoli and Torino have joined the Hammers in the race for the 24-year-old frontman, with a view to signing him now or in the summer.
Milan and Napoli have also met with Dia’s entourage as they step up their efforts to land the player.
However, Dia and his advisors are currently inclined towards staying at Reims until the end of the season before considering his future.