Watford have signed 19-year-old striker Obbi Oulare on a five-year deal from Club Brugge.
The Belgium Under-21 international came through the academy ranks at Lille in France before moving to Brugge in 2013.
Oulare has scored nine goals in 39 appearances for the Belgian side.
Midfielder Miguel Layun earlier joined Porto on a season-long loan from Vicarage Road.
The Mexico international joined the Hornets in January, helping them to promotion to the top flight, but now could be in Champions League action with Porto.
Watford said on their official website: “Watford midfielder Miguel Layun will spend the rest of the 2015/16 campaign on loan to FC Porto.”
Layun played 17 times Watford after completing a permanent switch from Grenada on a four-and-a-half-year deal in January 2015.
He has played four times for the Hornets this term and scored his only goal at Everton on the opening day of the season.