Okore's representative Nikola Juric is aware of the rumours.
"I heard that Fulham made an offer to sign Okore but his club rejected the proposal," Juric told Expressen.se.
"A lot of teams are interested in him. Half of the clubs in the Premier League are after him, so is Lyon and many others.
"He is only 20 years old and, if he signs with a club in England, he obviously won't be expecting to be playing regularly right away.
"So he knows that he has to be thorough sorting through all these offers and, for him, the most important thing is that a new club has a plan for him."