However, he has rejected both Liverpool and Bayern in favor of staying at Leverkusen.
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"You never know, at the moment I have enough on my plate to think about," he told reporters ahead of a Europa League quarter final first leg with West Ham United.
But I'm still young as a coach and for sure it's a nice one (thought).
I speak regularly with some colleagues who coach in the Premier League and they know that each game is really tough to prepare and to play.
"It's a very exciting competition with so many great players, coaches, great clubs, stadiums - and West Ham is one of them. We are facing them tomorrow with great respect but with great excitement that we have a great chance to go through and keep going in a great season as well."