The Glasgow giants were thought to be interested in the Republic of Ireland captain in the summer and could look to take him on loan for the rest of the season.
The 29-year-old has lost his place in Harry Redknapp's starting line-up in recent matches, with Jermain Defoe and Peter Crouch preferred up front.
Target: Tottenham Hotspur striker Robbie Keane
White Hart Lane boss Redknapp has admitted he finds it hard to juggle his attacking resources, but unsettled Russia striker Roman Pavlyuchenko seems to be the player most likely to leave in January.
However, Celtic will try to tempt Keane, according to the Daily Mirror. An initial loan deal could lead to a permanent summer switch, according to the report, though Keane pulls in much higher wages than anyone else on the Parkhead payroll.
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