The 21-year-old is thought to be available for a fee of around £2million and the Ibrox side are understood to be interested as they seek to strengthen their defensive corps ahead of next season.
The towering centre-back currently plays for Slaven Belupo in his homeland, where his form over the past two seasons earned him a first cap from the national side.
A representative of the player’s agent told the Daily Mail: “There was a representative from Glasgow Rangers in Croatia three weeks ago.
“There is another story that Spartak Moscow are also interested. [Agent] Mladen Kliskinic has booked a flight to go and speak to them on Tuesday.
“But we are waiting for Slaven Belupo to confirm they’ve accepted a concrete offer. Until that happens nothing can be finalised.”
Meanwhile, Rangers are expected to finalise the transfer of Brighton defender Connor Goldson later this week. The centre-back will move for a fee of around £3million.