BERLIN, Feb 7: Bayern Munich defender Mats Hummels will formally join Borussia Dortmund, where he has spent the last year on loan, before the two Bundesliga sides meet on Sunday.

Bayern host Dortmund at the Allianz Arena this weekend and Hummels, 20, will sign for Borussia just before kick-off having joined the west Germany club on loan in January 2008, it was announced on Friday.—AFP