BERLIN • Bayern Munich may be on course for a treble on the pitch but all is not well off the field.

Bayern winger Arjen Robben has hit out at an alleged dressing room "mole" following reports that manager Pep Guardiola's relationship with his squad had deteriorated after he announced that he would leave the club at the end of the season.

Key players are also reportedly unhappy with Guardiola's strict style of management.

The Spaniard has denied the reports but Robben seemed to confirm that someone in the dressing room fed the media information.

"The player who has been leaking all these information to the press should take a good look at himself in the mirror," the Dutchman told German television channel Sport1.

"This is all rather painful. When you are a professional, you simply don't do things like that."

Bayern legend Lothar Matthaeus also suggested yesterday that Guardiola has become a divisive figure at the club.

"He caused much disturbance off the field. But he is one of the best coaches on the planet," he told Sky Sports in an interview where he questioned the 44-year-old's decision to leave the German giants, with whom he has won five trophies.

Bayern are top of the Bundesliga with an eight-point lead and are also in the running for the Champions League title - where they face Juventus in the round of 16 later this month, and the German Cup.

Guardiola is heading for Manchester City in the summer after the English club confirmed on Monday that he has agreed a three-year deal.

"Perhaps he wanted a new challenge. Of course I can understand Pep - his salary must be insane," said Matthaeus, with reference to speculation that Guardiola will be the world's highest-paid manager.

"And he wants to experience something new - despite the fact that he already had the best team in Europe."