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

https://web-wiki.win/index.php/If_Celtic_and_Feyenoord_Both_Want_Him,_What_Usually_Decides_It%3F

Borussia Monchengladbach have entered the race alongside Celtic and Feyenoord to sign Hertha BSC goalkeeper Tjark Ernst. According to Bild, Ernst's contract includes a €5 million release clause, which interested clubs can trigger to negotiate a transfer