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.
13. Christopher Scott (Bayern Munich)
20yo - Attacking midfielder was initially linked with Celtic back in January as he entered the final six months of his contract. Increasingly likely to extend his deal but the German giants could let him head out on loan this summer. | Getty Images
14. Jed Wallace (Millwall)
28yo - Winger has gained plenty of experience in the English Championship. Scored six goals and provided 11 assists in 38 starts last term but a move to Celtic could be off the cards now that James Forrest has signed a new deal. | Getty Images
15. Zinedine Ferhat (Free agent)
29yo - Midfielder was another player linked with Celtic back in January. Has since left Nimes in France and previously stated he wants to play at the highest level possible. However, at present a move for the Algerian looks unlikely. | AFP via Getty Images