Watford are considering moves for Marseille's Zambo Anguissa and Anderlecht's Leander Dendoncker ahead of Wednesday's transfer deadline, Sky Sports News understands.
Dendoncker - a Belgium international midfielder - has been of strong interest to West Ham this month, but the Hammers are currently hoping to sign Morgan Schneiderlin from Everton.
Anguissa is a Cameroon international defensive midfielder who has played 23 times in Ligue 1 for Marseille this season and has 11 caps for his country.
Watford remain keen to bolster their squad for new manager Javi Gracia, and they confirmed the signing of forward Gerard Deulofeu on loan from Barcelona earlier on Tuesday - their first addition of the January window.
Sky sources also understand they are in talks with Fulham to let Stefano Okaka join the Championship side.