According to reports, the 25-year-old will criticise the German club for standing in the way of his move to Manchester United.

Relations between the two clubs soured on Tuesday when Bayern threatened to report United for breaching Fifa rules with their pursuit of Hargreaves.

The England international's Bayern contract runs until 2010.

And Bayern are particularly keen for him to honour that after losing Michael Ballack to Chelsea over the summer.

United are thought to be prepared to offer up to £17m for Hargreaves, whose stock rose with some impressive performances at the World Cup.

But Bayern general manager Uli Hoeness said: "Bayern Munich will never be taken for a ride and become weak at the knees as soon as a certain level of money is mentioned."