Bayern Munich captain Philipp Lahm has indicated that Thomas Muller will not necessarily remain at the club this summer.

Star forward Muller is a reported target for Manchester United and although some publications have suggested a move is not on the agenda, Lahm is not so sure.

The former Germany skipper has already seen Bastian Schweinsteiger depart the Allianz Arena for Old Trafford and was unable to make assurances regarding the Bayern future of World Cup hero Muller.

"It's not my decision," Lahm said in Shanghai on Bayern's pre-season tour.

"Things can happen very quickly in football. I certainly can't provide any guarantee for Thomas Muller [staying]."