Celtic will need to shake off interest from Leeds United and two more English Premier League clubs if they want to sign Rabbi Matondo, according to reports.
It was reported recently that the Welsh international had opened talks with the Parkhead club over a potential Premiership transfer this summer.
Formerly of Manchester City, he is likely to move on to pastures new as he heads into the final year of his contract at newly-promoted Bundesliga club Schalke.
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They bought him for a supposed fee of £11.3m. three years ago and he has featured 32 times in Germany.
Still only 21, Bild report that Leeds United hold strong interest in him while Brentford are also keen on adding him to their ranks, alongside Celtic and a host of European clubs.
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Nottingham Forest have just been promoted to the division and have also reportedly set their sights on the 21-year-old, who scored 10 times during a loan at Cercle Brugge in season 2021/22.
Postecoglou has already bolstered his ranks this summer ahead of their title defence and Champions League group stage run with the permanent signing of centre-back Cameron Carter-Vickers from Tottenham.