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An own goal from Adrian Mariappa denied Watford a crucial three points after taking the lead at Brighton.
Leon Balogun and Solly March are in contention to return for Brighton in Saturday's FA Cup third-round tie at home to Sheffield Wednesday.
Tottenham are expected to be without Heung-Min Son when they host Brighton in Boxing Day's Premier League encounter.
Freddie Ljungberg will hope to have Hector Bellerin available for his first home game in charge of Arsenal when they take on Brighton on Thursday.
Brighton will be without Solly March for up to a month after the defender underwent groin surgery.