Jerome Boateng sports purple hair colour as Bayern Munich train for new season - in pictures

European champions Bayern Munich hardly have any time to rest on their laurels. After defeating Paris Saint-Germain in the Champions League final on August 23, Bayern have returned to training as they prepare for the new Bundesliga season that begins on September 18. While Bayern have no dearth of star power, one player stood out during training. It was difficult to miss Jerome Boateng, who sported purple hair colour and a sharp hair cut. Spain midfielder Thiago Alcantara, who has been linked to Liverpool and Manchester United, also took part in Bayern Munich's first full training session for the new season. With a year left on his contract, the 29-year-old has stalled over signing an extension with the Champions League winners after garnering interest from Premier League sides. Club bosses said the central midfielder told them he wants a "fresh challenge" after seven years in Munich. However, last weekend Alcantara stated "I have never said I want to leave". Austria defender David Alaba, who also trained Friday, is another player stalling over extensions talks. Midfielder Javi Martinez, 32, whose contract expires in 2021, has been linked to a transfer back to Spain or a move to China.

Jerome Boateng sports purple hair colour as Bayern Munich train for new season - in pictures

Liverpool and Manchester United target Thiago Alcantara trains ahead of Bundesliga opener against Schalke