The agent of Martin Stranzl claims Celtic are considering a summer swoop for the Spartak Moscow defender.
Stranzl is understood to have caught Celtic manager Gordon Strachan's eye as part of the Austria side which were eliminated from Euro 2008 Group B.
The 28-year-old's Spartak contract expires at the end of 2008 and, according to Stranzl's representative Thomas Boehm, Celtic are considering a move.
Spartak are keen to secure Stranzl for another 12 months, but the centre-back is said to be keen on a move to Britain.
"We know there is interest from Celtic," Boehm told the Evening Times:
"Gordon Strachan and his agent were in Austria to watch Martin. We'll see what happens next.
"Martin is happy at Spartak but he has always been very interested in playing for one of the big teams in England or Scotland.
"Spartak have already tabled an offer for him to stay in Moscow, but nothing is being ruled in or out at this stage."