Celtic have been strongly linked with a variety of players in recent months with manager Ange Postecoglou seemingly keeping his options open in terms of signing targets this summer.
The Hoops boss is reportedly keen to strengthen his backline, with the addition of a left-back and possibly another centre-half his main priorities.
Another area that might require reinforcements is the goalkeeping position following the departure of Greek flop Vasilis Barkas on loan to Dutch club FC Utrecht last week.
It leaves the Parkhead side with only Joe Hart and Scott Bain as senior keepers, which could tempt Postecoglou into the transfer market.
Celtic are gearing up for the Champions League group stages next season and the Australian will be eager to bolster his first-team squad with added experience over the coming weeks.
So who have Celtic already been linked with so far this summer? GlasgowWorld takes a look at 15 players that are on the club’s radar.