Now Gregan has had a written request to leave the club accepted by the Albion board.
"Sean has stated he wants to leave us because he doesn't feel he will get adequate first team opportunities next season and wants regular football elsewhere," chairman Jeremy Peace told the Albions official website.
"Therefore, the board has reluctantly accepted his written transfer request.
"Sean has figured in 81 of our last 86 competitive games and his contribution as captain to our promotion success last season, particularly during the final weeks, was vital.
"Having paid £1.75 million to sign Sean only two years ago, we will only let him go if we receive an acceptable offer.
"Sean still has up to two years left on his contract and we are under no financial pressure to sell him or any of our players."