"Jerko has always had a wish to play in England or Scotland," agent Damir Jozic said in the Daily Mail. "He likes the British style of football.
"I know Celtic are looking for a No 6-type player, an aggressive midfielder but we will have to wait and see what happens between the clubs.
"Portsmouth, Bolton and Shakhtar would also like to sign him. I think the fee would be between €3 million (£2.35 million) and €4 million (£3.1 million) but, again, it would be up to Monaco to react to offers.
"It is impossible to predict exactly what will happen but, to my mind, if Celtic want the player then he will sign for them.
"There can always be a solution."