The 26-year-old suffered the setback during the club's tour to Spain.
Speaking after the Seagulls' 3-0 victory over Worthing, boss Gus Poyet confirmed the former Bristol Rovers player's injury.
"Unfortunately (he) has a broken foot," he told the club's official website.
"It didn't seem too serious, but on Monday morning it was very painful so we got it examined.
"We will have to get it right, possibly an operation and it will probably take about six weeks."