Thompson has played four times in League One for Brentford
Northern Ireland international Adam Thompson has extended his loan spell at Brentford by a further month.
The 19-year-old Watford right-back arrived at Griffin Park in August and has gone on to start five games.
Thompson scored on his Bees debut against MK Dons in the Johnstone's Paint Trophy.
The Watford academy product has played 11 times for the Hornets after signing his first professional deal with the Championship side in November 2010.