Celtic boss Neil Lennon is coy over their interest for Newcastle United goalkeeper Fraser Forster.
Forster had a successful loan at Celtic last season.
He said: "I can't comment on Fraser because we've been warned off by Newcastle already.
"I don't want to be accused of unsettling a player at another club, but we put in a bid, so he's a player that interests us.
"I am not saying we will not go back in for him."