Brentford have signed Watford's Piero Mingoia on a month-long loan deal and extended the loan deals of defenders Jake Bidwell and Harlee Dean.
Enfield-born midfielder Mingoia, 20, is a Watford academy product who has made two league starts for the Hornets.
Southampton's Dean, 20, signed a loan deal at the Bees in November but will now stay for the rest of the season.
Everton's Bidwell, 18, also arrived on loan in November and will remain with the club until 14 February.
The England Under-19 defender made his Bees' debut against Barnet in the Johnstone's Paint Trophy and has gone on to make four league appearances during his time at Griffin Park.
Bidwell came through Everton's academy and is the club's youngest player to feature in a European tie after making his first-team debut against BATE Borisov in a 2009 Europa League game.