According to reports by Sport, Barcelona general manager Andoni Zubizaretta has been working hard to try to bring the Borussia Dortmund defender to Spain, and manager Pep Guardiola has placed him as a high priority swoop for the reigning La Liga champions.
The 22-year-old helped Dortmund to a Bundesliga triumph last season, and was part of their stingy defence that conceded a mere 22 times last season.
What has attracted Barcelona is his versatility, as the player can also be used as a defensive midfielder, as well as his intelligent distribution and positional awareness for club and country.
However, he has penned a contract extension till 2014, and apparently cancelled a release clause in his contract, and this could be a stumbling block in any deal.
There is also an interest from Juventus for the defender, and Barcelona may find it difficult to pry Hummels from the Bundesliga, and have already shortlisted AC Milan's Thiago Silva or Valencia's Victor Ruiz as possible alternatives.