Lindsey Burrow says there is not a "more deserving recipient" of a knighthood than Kevin Sinfield, following the announcement in the King's Birthday Honours list.
Lindsey's late husband Rob Burrow and Sinfield were best friends and Leeds Rhinos teammates and together raised millions of pounds for the motor neurone disease (MND) community following his diagnosis in 2019.
After Burrow's death in 2024 aged 41, Sinfield continued his MND fundraising through a series of punishing challenges and has so far raised more than £11m.
"As Rob used to say, everyone should have a friend like Kevin and so many people will be pleased to see him get this recognition," said Lindsey.
"On behalf of the whole Burrow family, I would like to congratulate Kevin on his knighthood - we are all delighted for him.
"I know he has said he is dedicated to supporting the MND community for however long it takes to find a cure and that means so much to so many people to have a champion like Kevin in their corner."
The knighthood is being awarded for services to rugby and the MND community.
Sinfield's fundraising has helped to fund the state-of-the-art Rob Burrow Centre for MND facility in Leeds.
Tanya Curry, chief executive of the MND Association charity, said: "It's almost impossible to put into words just how much Kevin's support means to us and to people living with this devastating disease.
"His drive, his determination, his empathy and kindness for people affected by MND always shine through and I know how much that means to our community."
She added: "Sir Kevin – we hope you take the time to enjoy this special moment, along with your wonderful family and friends. Thank you for everything you do to support us."
Sinfield has already been appointed OBE, CBE and MBE for services to rugby league and charitable fundraising.
He added: "I would like to thank my family for their wonderful support and all those who have given me their support over the years, I am incredibly grateful."