Graham Potter said Percy Tau missed Albion's final friendly of the summer for “a personal reason”.
He appeared to expect further developments in the next couple of days.
Talks have been ongoing over a move for Tau to Al Ahly in Egypt.
He scored and impressed in the previous friendly, at Luton.
But he was not among the 23 players listed to face Getafe last night.
Asked after the 2-0 defeat whether there was any news on the South Africa forward, head coach Potter said: “Not, not at the moment.
“There was a personal reason why he was not at the squad.
“We will see how the weekend goes and go from there on Tuesday.”
BRIGHTON 0 GETAFE 2: LIVE REPORT FROM THE AMEX
Potter said Moises Caicedo still had “slight issues” with the knee injury he suffered in the Copa America.
GRAHAM POTTER ASSESSES BRIGHTON DEFEAT BY GETAFE
Caicedo was hurt in a clash with Douglas Luiz as Venezuela played Brazil.
Potter said: “Hopefully nothing too serious but we didn’t want to risk him tonight.”
