Celtic have had a loan offer for Paris Saint-Germain left-back Mitchel Bakker rejected.
However, the Champions League finalists have not completely shut the door on a potential deal with Celtic.
Bakker, 20, came through the youth system at Ajax before joining PSG in 2019. He made three starts for the French champions last season.
Celtic and PSG have had a good business relationship in recent years, with loan deals for Timothy Weah and Odsonne Edouard - the latter becoming a permanent signing for £9m.
Sky Sports News reported on Friday that Celtic's priority in this transfer window is to sign a left-back.
They would also like to bolster their central defensive options and add a winger.
The summer transfer window will run for 10 weeks from July 27 and close at 11pm on October 5.
A domestic-only window for trades between the Premier League and EFL then runs from October 5 and closes on Friday, October 16 at 5pm. Follow all the news and analysis on Sky Sports News and across Sky Sports' digital platforms, including with our dedicated Transfer Centre blog.