FC Bayern München have extended the contracts of Thomas Müller, Jerome Boateng and Javi Martinez until 2021, while Xabi Alonso's deal now runs till 2017.

The record champions announced the new deals via Twitter on Friday.

Müller joined Bayern as an 11-year-old and is in the midst of his most prolific season since breaking into the side in 2009/10, having netted Bundesliga 13 goals already this term to equal his best haul for a single campaign. "I come from around here. I've been here for 15 years and obviously I'm delighted," the 26-year-old told FCBTV.

Click here for our dedicated page on Thomas Müller.

Boateng, 27, will complete a decade's service for the Reds upon the expiry of his new deal, having signed for the club from Manchester City FC in 2011. “I’m very happy that I could extend my contract here,” he told fcb.de. “I’m looking forward to the next years here and want to continue having success with Bayern. It’s a big contract for me, I’m happy.”

The versatile Martinez, 27, has had an injury-interrupted three years in Munich, but has nevertheless become a key member of the squad, He likewise expressed his delight at continuing his stay in Bavaria: “I’m very happy and proud to extend my contract until 2021. We’ve got a great team. Munich is the perfect city for a professional footballer, people have a lot of respect here. Everything’s great.”

Former Real Madrid CF man Alonso made 26 league appearances last term to help the Bavarians to a 24th Bundesliga title in May. The 34-year-old said: “I’m happy to have extended my contract by another year. My family feels very much at home in Munich, and that’s the most important thing.”

Click here for Alonso's reaction to scoring the winner in the DFB Cup against Darmstadt.