Brighton have rejected a second bid from Arsenal for Ecuador midfielder Moises Caicedo and told the Premier League leaders he is not for sale.
Arsenal and Chelsea both had offers for the 21-year-old turned down last week.
Caicedo informed Brighton in an open letter that he wanted a move, with the club responding by telling him to take time off until after Tuesday's transfer deadline.
He missed Sunday's 2-1 FA Cup win over Liverpool with manager Roberto de Zerbi saying he wants Caicedo to finish the season with the club.