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The Italian newspaper "Tuttosport" reports that Turin's "Juventus" club has also joined the race for the signature of Borussia Dortmund's center-back.
Mats Hummels, valued at 20-25 million euros, is also being closely monitored by Barcelona, which this summer is forced to look for reinforcements in defense.
The "Bianconeri" team would be willing to offer up to 25 million euros to the German vice-champions after this season, but negotiations could be hindered by the Catalans.
Barcelona coach Gerardo Martino has been interested in Hummels for some time, and after learning that this season is the last for defender Carles Puyol, the Argentinian will inevitably have to fill the gap.
The 25-year-old German has been playing for Borussia since 2008. During this time, he has played 209 matches and scored 20 goals.
