Midfielder Stuart Campbell could be on his way out of Bristol Rovers after contract negotiations broke down.
The 33-year-old's current deal runs out at the end of the season and boss Paul Buckle confirmed his name has been circulated to other clubs.
"We've not been able to agree," Buckle told BBC Points West.
"Stuart's got an advisor he uses and we received an email which said if we couldn't come to an agreement then they would look elsewhere."
Campbell has been at the Memorial Stadium for seven years and was caretaker manager at the end of last season following the departure of Dave Penney.
When Buckle took over in May last year, he opted to replace Campbell as captain and appoint Matt Gill in his place.
Campbell has played 10 League Two games for Rovers this season but was not in the squad for Tuesday's 3-0 home defeat by Port Vale, although Buckle described his absence as a "horrible coincidence".
"Stuart fell ill on Tuesday morning before the game which threw everything," revealed Buckle. "We've not seen him, he's not here this morning [Thursday]."
But he was quick to add: "He's part of the squad and it's like any player and any member of staff that's being paid week-in, week-out by the club, we expect them to give their all.
"We know he'll do that. It's just a horrible coincidence that we lost him on Tuesday because we could have done with his leadership."