Rebic contributed six goals and two assists from 25 Bundesliga appearances last season, and the attacker followed that up with an impressive showing in the World Cup with Croatia.
Rebic told Goal.com: "I had a great World Cup and an even better club season with Eintracht. I know there are concrete offers, I keep in regular contact with my agent.
"I'm glad I proved that everyone can count on me, but as I said there is enough time left until transfer window closes. Most transfers are done during the last days of the window so that is when my situation will be more clear."
Rebic - who is allegedly valued at £44m - still has three years remaining on his contract.