Luton have signed former Peterborough and Brighton striker Craig Mackail-Smith on a two-year deal.
Norwich City have completed the signing of goalkeeper Jake Kean following his release from Blackburn Rovers.
Quinn, who played a key role in Rovers' promotion to the Championship, has committed his future to the Keepmoat outfit until the summer of 2015.
The 28-year-old arrived in South Yorkshire last August and made 37 appearances last season.
Rovers have already secured the stay of winger Kyle Bennett and striker Chris Brown on fresh two-year contracts.