Warrington Wolves, Gregory's former club were quick to pay tribute to their former player. Lord Hoyle, the Warrington Wolves chairman, said: "I was deeply saddened to hear the news of Mike's death and my thoughts go out to his family and friends.
"Mike served our club with distinction as a player for 12 years, including captaining Warrington in their last Challenge Cup final appearance in 1990.
"Mike's brave battle against illness and his efforts to raise awareness of progressive muscular atrophy has been an inspiration to us all. He will be greatly missed, particularly by all his friends here at Warrington Wolves."
Warrington are accepting tributes and will open a book of condolence. Gregory leaves a widow, Erica, and two sons, five-year-old Ben and nine-year-old Sam.
Please take a moment to visit the Mike Gregory Trust Fund page - CLICK HERE.