Moises Caicedo missed Brighton training on Monday in an attempt to force through a move to Chelsea.
The Blues have seen three offers rejected for the midfielder, with the latest worth up to £80m, but remain confident of reaching an agreement.
Brighton value the 21-year-old at £100m but the player is keen to make the move to Stamford Bridge.
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Caicedo was left out of his side’s pre-season friendly against Rayo Vallecano on Sunday, sparking suggestions a move to Chelsea was close.
Chief executive Paul Barber, however, stressed the club expect him to be available for their Premier League opener at home to Luton Town on Saturday.
Chelsea manager Mauricio Pochettino is keen to strengthen his midfield options this summer after selling a number of players.
Ruben Loftus-Cheek, Kai Havertz, N’Golo Kante, Mason Mount and Matteo Kovacic have all left the club this summer as part of a major overhaul following such a disappointing campaign last time out.
