The Sir Bobby Robson Foundation has paid tribute to Liam Curry, who fundraised for the charity.
The 19-year-old began raising money at the age of 14 after his Granddad, Jack Allen, was diagnosed with cancer.
Liam completed a Coast to Coast cycle ride for the charity.
A statement from the foundation said:”We are devastated to learn 19-year-old Liam Allen-Curry and his girlfriend, Chloe Rutherford, are among the victims of the Manchester Arena bombing.
“Liam was an outstanding young man and a great credit to his family.”
The statement continued: “Cruelly, his Dad, Andrew Curry, was also diagnosed with cancer and died in March this year.
“Liam continued fundraising during his Dad’s illness and undertook a 260 mile sponsored cycle ride from Calais to Paris and a Great North Run to help raise funds for us.
“No words can adequately convey feelings at a time like this. Our thoughts are with Liam’s loved ones and all the victims’ families and friends.”