Borussia Mönchengladbach have reportedly joined Celtic and Feyenoord in...

https://victor-wiki.win/index.php/Is_a_%E2%82%AC5m_Clause_Something_Celtic_Can_Afford_Easily%3F

Borussia Mönchengladbach have reportedly joined Celtic and Feyenoord in pursuing Hertha BSC goalkeeper Tjark Ernst. According to Bild, Ernst’s contract includes a €5 million release clause, making him a realistic target for these clubs