The Hornets have signed their 4th player of the January transfer window, capturing the signature of highly rated Sweedish goalkeeper Pontus Dahlberg.
Dahlberg has signed from IFK Gothenburg for a reported £3.5 million fee, where he made 29 appearances.
The 19-year-old has put pen to paper on a five-and-a-half-year deal and will return to Swedish side on loan for the rest of the season.
Costel Pantilimon has been recalled from his loan spell at La Liga side Deportivo La Coruna and has joined Nottingham Forrest for the remainder of the 17/18 season.
The Romanion shot stopper made 6 appearances for the La Liga outfit before his recall.
Isaac Success has returned to Spain to join Malaga for the remainder of the season.
Watford signed the Nigerian striker from La Liga side Granada for £12.5m in 2016.
Success signed with plenty of promise but has only managed to secure 1 goal in 20 appearances for the Golden Boys since his arrival.