Leeds United stopper Will Huffer is new manager Darren Currie’s first signing.
Number one Mark Cousins was red carded against Braintree last weekend - and the Bees have acted to ensure they are well covered.
The 20-year-old has already played in the Championship this season, appearing in the 2-0 win over Bristol City.
Currie told the club’s website: "I'd like to welcome Will to our club and our group of players, he is a young man that comes recommended from a number of people that we have spoken to in the game.
"England representatives speak very highly of Will so he will be a terrific addition to the team, I'm delighted to have him on board."
Huffer said: "I'm really excited to get going. All the lads have welcomed me into the group, they have all been really enthusiastic.
"It's a great chance for me to play some more men's football, get some game time and gain some experience as well as hopefully winning some games whilst doing it."