Bayern Munich chief executive Karl-Heinz Rummenigge cannot rule out losing midfielder Thomas Muller over the summer.
Muller is unsettled and fancies joining former Bayern boss Louis van Gaal at Manchester United this summer.
Rummenigge is quoted by BILD: "If a player does not feel comfortable with Bayern Munich, he must come to my office. Then you have to talk about it."
Muller is contracted to the defending European champions until 2017 and it would take a bid in the region of 45million euros (£37million) to convince Bayern to sell.
