Inter Milan are rivalling Celtic for Filip Benkovic.
West Bromwich Albion were linked with Filip Benkovic and Ben Gibson in the summer.
Celtic are reportedly stepping up their pursuit of Dinamo Zagreb defender Filip Benkovic, who has previously been linked with the Hoops.
Bitton has only played for Celtic this season due to a defensive injury crisis - but signing Filip Benkovic in January could force him down the pecking order.
When Celtic signed Jozo Simunovic in 2015, Filip Benkovic stepped into his shoes at Dinamo Zagreb. Now, Celtic want the latter too.
Celtic were first linked with the Croatian defender at the start of the year.
Celtic need defensive reinforcements in January following their 5-0 defeat to Paris Saint-Germain.
West Bromwich Albion and Tottenham Hotspur appear to have yet another shared target.
Newcastle United have reportedly made a double bid for Dinamo Zagreb duo Filip Benkovic and Ante Coric.
Celtic have reportedly been keeping a keen eye on the Dinamo Zagreb defender.