Chelsea and RBL are haggling over a fee for the Holland international, with negotiations now at an advanced stage.
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For his part, Simons is ready to leave, having deleted RBL in his social media profile.
Chelsea and RBL are close to reaching terms over a fee "verbally", according to Sky Deutschland's Florian Plettenberg. However, no firm bid has yet been tabled.
Chelsea need to sell before closing a deal for Simons, who is rated at €60-70m by his Bundesliga club.
