Manchester City face a transfer battle with Barcelona over German international defender Mats Hummels.

The Daily Express claims Roberto Mancini is looking to ‘firm up’ his transfer strategy for the summer transfer window, with Hummels on the Citizens radar.

However, Spanish paper AS reports that Barcelona also have an interest in the £26m-rated Bundesliga star, who helped Borussia Dortmund to a second consecutive title in his homeland last term.

The La Liga leaders are looking to strengthen their defence at the Nou Camp, according to the report, and despite Carles Puyol penning a new deal in Catalonia, manager Tito Vilanova is building for the future.

Manchester City, meanwhile, have failed to settle on a consistent back-line, with Mancini mixing both personnel and formation in an effort to find the right combination at the Etihad Stadium.

Hummels would certainly give the Citizens some strength in-depth, with Vincent Kompany, Joleon Lescott and the impressive Matija Nastasic currently fighting for position.

However, other Premier League clubs have shown an interest in Hummels in the past, with title rivals Manchester United also reported to be keen on the 24-year-old.

And, were one club to make a first move, it could lead to a summer transfer battle for the former Bayern Munich starlet.

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