Mats Hummels poses with Bayern Munich shirt after completing £30m move from rivals Borussia Dortmund

Mats Hummels' switch of allegiance became official on Monday after he was pictured putting pen-to-paper on a Bayern Munich deal.

Hummels was all smiles in Bavaria as he officially signed a five-year contract with the German giants next to club chief Karl-Heinz Rummenigge.

The centre back also posed alongside the latter as he held a Bayern Munich home shirt ahead of next season.
Earlier this month, Bayern confirmed the signing of Hummels from Bundesliga rivals Borussia Dortmund for £30million.

The Germany international has long been linked with a return to the club he started his career with before leaving for Dortmund in 2009.

Carlo Ancelotti, who will take over from Pep Guardiola at the end of the season, has boosted his defensive ranks with the signing and the move has been hailed by Rummenigge.

'We're delighted that Mats Hummels has decided to join Bayern,' said the Munich chairman on his club's website earlier this month.

'Mats is one of the best central defenders in the world and we're able to improve the quality of our team even further with him.'

Hummels had one year left to run on his contract at Signal Iduna Park and had informed Dortmund recently of his desire to leave them this summer.

But the defender, who initially joined Dortmund on loan in 2008 before sealing a permanent move the following season, has revealed his emotional attachment towards the club.

'This was not an easy decision for me after eight and a half successful years with BVB,' he told the club's website. 'I was always proud and still am to wear the BVB shirt and to be part of this extraordinary team.'