Loanee Izzy Brown is back with his parent club Chelsea as Albion wait for an update on his hamstring injury.
The 20-year-old, who is on a season-long loan at the Amex, limped off after just 24 minutes of Brighton's opening Premier League game of the season against Manchester City on Saturday.
Seagulls boss Chris Hughton said: "He's gone back as part of the agreement to Chelsea for assessment.
"That's a normal procedure for them and their loan players. We'll find out more later today or tomorrow."
Hughton added there were no other problems to come out out of Saturday's match but added striker Sam Baldock is expected to be out for "a decent period of time" with his calf injury.
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