Some, like Ed Williams and Andy Butler, earned longer stays while others were free to move on. Here, we take a look at each of the players that Darren Moore ran the rule over during pre-season.
1. Marcus Barnes
Part of the second wave of trialists, the midfielder featured against Derby County before his trial was ended. The 23-year-old - who is the younger brother of former Rovers midfielder Giles - was released by Southampton earlier in the year.
Photo: Nathan Stirk
2. Andy Butler
Far from an unfamiliar face to Rovers fans, former club captain Andy Butler came in as part of the second wave of trialists. He featured in friendlies with Derby County and Manchester United U21s before being handed a contract until January alongside his role as Belles manager, having left Scunthorpe United at the end of last season.
Photo: Dean Atkins
3. Canice Carroll
A versatile holding midfielder, who was previously on the books of Oxford United and Brentford, Carroll was one of the more recent trialists involved for Rovers and played in the friendly with Manchester United U21s. The 21-year-old - who finished last year at Stevenage - did not do enough to earn a contract.
Photo: Harry Trump
4. Jordan Davies
The midfielder had done enough to be offered a contract with Rovers - but did not wait around for a formal offer to be made and instead signed a two-year deal with his former club Wrexham. The 22-year-old was released by Brighton and Hove Albion earlier in the year and arrived among the first wave of trialists with Rovers, featuring against Scunthorpe United and Bradford City.
Photo: Pete Norton