The agent of Ivan Ramis has claimed that Celtic are interested in signing the Real Mallorca defender.
Sky Sports News revealed earlier this week that the Scottish club had set their sights on Ramis as an alternative transfer target to Sean St Ledger of Preston.
Ramis' representative, Javier Diaz, says the Bhoys are now locked in talked with Mallorca over a possible deal.
However, it is unclear whether a move could be finalised before Monday's 5pm deadline.
"I don't know if an agreement will be reached by Monday night, but the clubs are talking and trying to reach an agreement," said Diaz.
Reports claim Mallorca are seeking around £3million for the 25-year-old, who would be a direct replacement for Stephen McManus following the Scotland defender's loan move to Middlesbrough.