Skysports.com understand Celtic are considering a move for Everton defender Gary Naysmith.
The Bhoys are keeping tabs on Naysmith in case they fail to agree a deal for Michal Kadlec.
Celtic are chasing Sparta Prague ace Kadlec, but the deal has stalled over his transfer fee.
The Scottish champions are now drawing up a list of alternative targets should the Kadlec move fall through and Naysmith is thought to be top of their wanted list.
Celtic have held a long-term interest in Naysmith and have tried to sign him on previous occasions.
Naysmith's future at Everton is unclear as he is well down the pecking order at Goodison Park.
The Scottish international could be tempted by a move to Glasgow in the search for regular first team football.