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.
5. Benjamin Siegrist (Free agent)
30yo - Goalkeeper left Dundee United at the end of the season. Celtic have made contact with the Swiss stopper’s representatives and he could provide added competition between the sticks. | Getty Images
6. Ko Itakura (Manchester City)
25yo - Utility man spent last season on loan at Schalke in the Bundesliga 2. The German club have decided against taking up their option to buy clause of £6m. Could he be tempted to join up with several of his Japan team mates at Celtic this summer? | Getty Images
7. Ola Solbakken (FK Bodo/Glimt)
23yo - Talented Winger caught the eye when Celtic were knocked out by the Norwegian club in the Europa Conference League last season. Is due to undergo surgery on his ankle and could be an ideal back-up option is Jota decides against signing a permanent deal. He would cost around £1.6m but Roma are also thought to be keen on him. Photo: Paolo Bruno
8. Mohammed Abu Fani (Maccabi Haifa)
24yo - Holding midfielder has been monitored closely by the Hoops, along with two Belgian clubs. The Israeli international still has three years left on his current contract and would cost Celtic just under £1m if they were to firm up their interest. | Getty Images