Joe Ledley admits he has been impressed by what Celtic have to offer as he considers a move to Parkhead.
Wales international Ledley is available as a free agent after seeing out his contract at Cardiff and he is mulling over his future.
A number of clubs, including Stoke and West Brom have been credited with an interest in the midfielder, but it appears Celtic are the head of the queue for his signature.
Ledley travelled to Glasgow earlier this week for talks and a medical, but he insists the move is not a done deal.
"It's not a done deal yet. Obviously I've got a lot to think about," Ledley told the Daily Record.
"I just came up for a look around, but I've been very impressed. Will I be back? We'll see."
Meanwhile, Celtic have taken Northern Ireland youngster Liam Boyce on trial.
Cliftonville striker Boyce has attracted interest from a number of clubs in the past year after impressing for the Irish Premier League side last term.
The 19-year-old is set to spend a few days training with the Celtic first-team squad so that Neil Lennon can cast an eye over him before deciding whether or not to pursue his interest.