Tottenham want to wrap up a deal with Sporting Lisbon for right-back Pedro Porro today amid fears Chelsea could hijack the move.
Spurs' £32.5m bid was knocked back but talks with the Portuguese side will resume on Wednesday morning over a revised structure of payments, plus bonuses and a possible player in return.
Porro, 23, is of interest to Todd Boehly's big-spending Blues, who are lurking if Tottenham's move breaks down, but the player's agent is focusing on Spurs first and seeing whether the clubs can agree a fee before discussing any alternative options.