The Holland international has been a target for Chelsea this summer.
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BBC Sport says Chelsea have offered RBL several players in an attempt to set up a swap arrangement.
Both Carney Chukwuemeka and Tyrique George have been offered by Chelsea in part-exchange for Simons.
Christopher Nkunku has also been mentioned, though the France attacker is reluctant to return to his former club, particularly after they missed Champions League qualification.