Flekken, ​the Dutch international keeper, suffered a knee ligament injury while Nigeria ‌international Tella, who had come on as a substitute, ⁠picked up a foot injury.

"Both players will not be available for a longer period of time," the club said.

Leverkusen, who take ⁠on Olympiacos in ‌the Champions League on Tuesday, are sixth in the Bundesliga standings.

[lslink-league cms-href="https://www.flashscore.com/match/football/union-berlin-pzHW4oaE/vfb-stuttgart-nJQmYp1B/?mid=lrCyogAk" sport-id="1" tournament-template-id="W6BOzpK2" tournament-id="QwzghtID" tournament-stage-id="8UYeqfiD" season-id="187" target="summary"]Follow the Bundesliga with Flashscore.[/lslink-league]