Brighton have rejected a further bid from Chelsea, believed to be around £80m, for midfielder Moises Caicedo.
Caicedo, 21, is with Roberto de Zerbi's squad in New Jersey, where they are set to play Newcastle on Friday.
Brighton are understood to have rejected the revised offer instantly, and are said to be committed to keeping the Ecuador international.
Caicedo is one of Chelsea's long-term transfer targets and two bids have been previously rejected.
However, Brighton adopted a similarly hard-line approach with Chelsea last year and relented when the bidding rose above £60m for defender Marc Cucurella.