Defender Aaron Hughes is set to miss Northern Ireland's Euro 2016 qualifier against Romania.
Hughes, 34, injured his ankle in Brighton's 3-2 defeat at Bournemouth at the weekend and is unlikely to feature in Bucharest on November 14.
The centre-half has been ever present in his country's best ever start to a major qualifying campaign - playing 90 minutes in successive wins over Hungary, the Faroe Islands and Greece.
Fears of a broken ankle have been allayed and though he may yet appear in manager Michael O'Neill's squad on Tuesday, it seems unlikely he will be fit to feature.
Seagulls boss Sami Hyypia told the Argus: "There is nothing on the bone, so that's a good thing.
"If the bone was broken or something happened to the bone it would be a long process.
"Now we are waiting for the swelling to go down. Then we will be able to assess it a little bit better.
"If it's ligament damage we are talking about weeks more than months I think. I'm not a doctor so I can't really say how long and every individual heals in a different time frame."
The former Northern Ireland captain is currently on 93 caps, on track to become his country's first ever outfield centurion.