Borussia Monchengladbach have entered the race alongside Celtic and Feyenoord...

https://wiki-site.win/index.php/Why_would_Moritz_Nicolas_reject_an_offer_from_another_Bundesliga_club%3F

Borussia Monchengladbach have entered the race alongside Celtic and Feyenoord to sign Hertha BSC goalkeeper Tjark Ernst. According to Bild, Ernst's release clause is set at €5 million, making a move this summer a clear possibility