Aston Villa midfielder Shaun Maloney is in Glasgow for talks with Celtic about a possible return to the club.
However, the SPL champions say reports that the 25-year-old has already signed are premature.
Maloney has been persistently linked with a return to Celtic since his switch to Villa Park in January 2007.
Last week, the player's agent John Halliwell claimed that three clubs had expressed an interest in the unsettled Scotland international.
Malaysian-born Maloney, who made his Celtic debut in April 2001, left for a £1m fee after failing to agree new terms at Parkhead.
Maloney has not established himself as a first-team regular at Villa and would face stern competition for a place if he does return to Celtic.
But Celtic midfielder Paul Hartley believes added strength in depth can only be good for the club.
"I played with Shaun at international level and I know what he can bring to the team," said Hartley.
"We have five or six Scottish internationals in the Celtic team already, so he will be another good addition.
"I'm sure, if Shaun signs, he will relish the chance to return.
"We are always looking to improve and he is another good player.
"We have a good squad as it is now and we know Shaun can play in a number of positions.
"He had a good spell at Celtic the first time, so I'm sure he will do well again."
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