Hearts are considering making a move to sign their former captain, Michael Stewart, for a third time.
The 30-year-old's representatives are understood to have been in touch with Hearts and the club are now considering entering discussions.
Scotland midfielder Stewart left Hearts in May 2010 when then manager Jim Jefferies decided he did not feature in his long-term plans.
He then had a troublesome spell with Genclerbirligi before joining Charlton.
Stewart signed a one-year contract with the Turkish top-flight club with an option of a further two years.
However, the Scot left the club after claiming they had not honoured his contract while he was out of action through injury.
Stewart joined League One outfit Charlton until the end of the season in February after a trial spell with Leeds United.
However, he left the Valley in the summer and could now return to Tynecastle.
Stewart, who has four Scotland caps, spent his first spell there in season 2005/06 before making the move across the city to join Hibernian.