The Blues feel that they will land their man, although the move hinges on ironing out issues regarding agent fees in a separate negotiation
Chelsea are confident that Sevilla's Jules Kounde will end up at Stamford Bridge this summer but their approach is conditional on Kurt Zouma moving to West Ham.
With the Blues having found a verbal agreement to sign the 22-year-old, they also know the terms that the Liga side will agree on.
Meanwhile, Zouma's talks with West Ham over a £26 million ($36m) move have been smooth on the club side.