Jake Bidwell will remain on loan at Brentford a further month.
The left-back, 19, joined the League One side in August on an initial one-month deal, with several extensions bringing his spell into the New Year.
He will now remain with the Bees until 5 March.
Everton's Academy graduate spent much of last season on loan with Uwe Rosler's side and has made 32 appearances this term.
Having been suspended for the initial FA Cup fourth round tie against Chelsea, Bidwell remains eligible to feature in the replay later this month.