Estonia international stopper Sergei Pareiko has confirmed joining Celtic in January would be his first choice.
The 33-year-old currently plays for FC Tom Tomsk, although his contract with the Russian outfit is ending and he will be available on a free transfer.
Pareiko has known about Celtic's interest for a month and while the club have not put an offer on the table he remains eager to join the Scottish giants.
"A move to Celtic would take my career to a new level - I'd love to play for such a truly big club," he told the Scottish Sun.
"I can't say how close we are to an agreement as Celtic have not made a specific offer yet, but I have known about their interest for about a month.
"Stevie Woods visited Estonia and I've spoken to him. He made a proposal to Neil Lennon to sign me in January when the transfer window opens.
"Lennon has accepted the recommendation and we are waiting to hear from the club's board.