Celtic are set to begin formal negotiations with Quinton Fortune within 48 hours.
The South Africa international was released by Manchester United this summer after failing to hold down a regular first-team place at Old Trafford following a knee injury.
The 29-year-old utility player was at Celtic Park on Friday for an informal meeting with manager Gordon Strachan.
Fortune is also being courted by Bolton and Manchester City but the player's agent, Francis Martin, hopes to begin serious discussions with Celtic chief executive Peter Lawwell on Thursday. PA