Roberts, who hasn't played for The Lions in over a year, has struggled with injury since re-joining The Lions in 2002/03 and last year failed to get a squad number following a tabloid scandal. Joe Dolan, meanwhile, has been given a free transfer. Dolan, who has been attracting interest from Brighton & Hove Albion, has spent much of the season on loan with various clubs, including The Seagulls, helping them to avoid relegation from The Championship.
"We have granted Joe a free transfer," Burnige told the club's official website, "because we want him to have the best possible opportunity to find a club where he can get regular first team football after his lengthy battles against injury.
"He was a popular figure at The Den and we wish him well."
The Lions' Chairman also confirmed that youngsters Trevor Robinson, Jason Rose and Joe Healy have all accepted new deals.