United Kingdom, Nov. 21 -- Louis Tomlinson has donated £4,000 to help fund life-saving surgery for a former One Direction bodyguard.

Preston Mahon requires a bypass or amputation due to blocked arteries in both of his legs, and he is hoping to raise £35,000 to pay to go under the knife after "exhausting" his savings on an initial private operation in Spain.

Louis, 33, has pledged the four-figure sum to help the boy band's former minder, and Preston - who also looked after Simon Cowell, Boyzone, Westlife, Leona Lewis and The Enemy throughout his career - "can't thank" the 1D star "enough" for his generosity.

He told The Sun: "I'm so appreciative. It means the world to me.

"I can't thank him enough. Wow. I wasn't expecting tha...