Derby County manager Nigel Clough says he will allow goalkeeper Frank Fielding to leave Pride Park, with Bristol City reported to be chasing his signature.
The 25-year-old has made 80 appearances in total for the Rams and he earned himself a call-up to Fabio Capello's England squad in 2010.
Team-mate and fellow keeper, Adam Legzdins, has also been made available for transfer following the signing of Lee Grant from Burnley.
Derby have made seven first-team players available for transfer this summer and Clough insists he will not stand in the way of either goalkeeper heading for the exit.
"If offers come in, Adam and Frank will both be allowed to leave," he told the Derby Telegraph.
"We would love to keep one of them as the number two but they don't want to do that.
"Both have had a taste of first-team football. Once you have had that taste, you don't want to sit on the bench.
"I think they are two very good keepers with huge potential."
Coles' former side have been tipped by many to challenge at the top of the League Two table and their trip to St James Park gives the Grecians the chance to see how they measure up against John Ward's promotion hopefuls.
"It's always great to play against your former team and it'll be a really good game for us to start the season," he told the club's official website.
"Bristol Rovers will be one of the contenders and pushing for promotion, so to play against them on the first day is a good way to start. We'll be looking to get the three points and go from there.
"For this division, they've got some strong players and they'll probably add to that before the start of the season. They'll be one of the favourites with the bookies, so it'll be a good test for us."
