ANDY Murray has signed a deal with American apparel company Under Armour, officially ending his association with sportswear giant Adidas.

Murray's lucrative four-year contract with the Baltimore-based brand is believed to be worth £15 million.

The 2013 Wimbledon champion will now sport Under Armour's clothing, footwear and accessories during competitions, in addition to featuring in marketing campaigns for the company.

Official confirmation of the deal comes weeks after a photo of Murray sporting a t-shirt from the brand hinted he was on the cusp of a move away from Adidas.

The Scot had posed for a photo with a fan which aficionados took as confirmation he had finally switched clothing sponsorships.

His sponsorship deal with Adidas is believed to have been worth £15m over five years.

In a statement on his website, Murray, currently ranked number six in the world, said: "I am very honoured and excited to be joining Team Under Armour and to help them tell their story globally.

"They are committed to providing innovative apparel, accessories, and footwear, with an unmatched focus on training and performance."

Ryan Kuehl, of Under Armour, added: "Andy's remarkable character, competitive spirit and unmatched ability make him the perfect fit for our family."

Murray, who started his career wearing Fred Perry, joins a roster of athletes at Under Armour which includes NFL legend Tom Brady, skier Lindsey Vonn, fellow tennis player Sloane Stephens and rising golf star Jordan Speith. They are also the brand behind the Tottenham Hotspur strip.

However, Murray will continue to wear Adidas' Barricade shoes until Under Armour have developed footwear specifically for him in the next six months.

It comes a months after it emerged and long-time girlfriend Kim Sears were now engaged.

The sports star, 27, popped the question in late November. The couple, who share a house in Surrey, have been together for eight years after meeting at a party in South Africa.

Despite the deal, Roger Federer remains the highest earner in men's tennis with his 10-year Nike contract worth a reported $140€‰million (£90€‰million), while Novak Djokovic makes €8€‰million (£6.27€‰million) a year from the Japanese outfitter Uniqlo.