Ed Williams (right) earned a deal with Rovers after impressing on trial
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.
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.
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.
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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.
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.
The goalkeeper featured in the friendly at Bradford City as Darren Moore considered adding a third goalkeeper to his squad for cover. The former Wolves youngster was latterly in the EFL with Scunthorpe United before dropping into non-league. He featured for Rovers U23s in at least one game for cover.
The midfielder featured in the friendlies against Bradford City and Scunthorpe United before his trial was ended. The 24-year-old Cameroonian spent two months with Dundee United three years ago in his only spell in British football but has based himself in London this summer in order to try to find a club. Previously he has featured for clubs across Europe.
The former Rotherham United forward impressed during his time on trial with Rovers, having featured in the friendlies with Derby County and Manchester United U21s. But having secured other attacking targets, Rovers were unwilling to stretch the budget in order to snap up the 20-year-old.
The right back has been offered a contract with Rovers after impressing during his trial, which included game time against Manchester United U21s. The 20-year-old is a free agent after leaving Bournemouth earlier in the summer.
The former Sheffield United winger was among the first group of players invited in on trial by Darren Moore and played in the friendlies with Scunthorpe and Bradford before he was let go.
The former Kidderminster Harriers midfielder was among the first group of trialists invited in my Moore and played in the friendlies against Scunthorpe United, Bradford City and Derby County. He impressed enough to earn a two-year contract, which sealed his return to the EFL after being released by Cheltenham Town as a youngster. He has come off the bench in all three of Rovers' competitive fixtures so far.