All the info from team news to travel ahead of the mouthwatering London derby in E10
FORM: Orient are in good shape and are unbeaten in their last six and will return to the top of the League 1 table should they pick up three points against the Bees who sit one place below the O's in third, a point behind, with two games in hand.
The visitors have been in sensational form since the autumn after they went on a 19-game unbeaten run before defeat at home to Wolves last month, though they have responded well to defeat and are unbeaten in their three games since.
TEAM NEWS: O's boss Russell Slade will make a late decision on the fitness of French pair Mathieu Baudry (hamstring) and Romain Vincelot (foot).
The visitors are close to full strength, with midfielder Sam Saunders still out after knee surgery. Centre-back Harlee Dean (groin) will be assessed.
TICKETS: The game is SOLD OUT with no tickets available. If you missed out, the game will be live on Sky Sports and there will be full commentary on Orient Player.
Supporters MUST sit in the seat number on their ticket.
Turnstiles in the South Stand open at 10.30am and 10.45am elsewhere in the stadium. SUFTO season tickets tickets are not valid for this game.
BETTING: Brentford are slight favourites at 6/4 with the O's at 7/4 and the draw is priced at 23/10. For all the markets and sign up deals head to www.skybet.com/Orient
HOSPITALITY: Guests should bring their tickets and arrive at the West Stand reception from 10:30am
ELSEWHERE: There is a Help for Heroes bucket collection pre-game and former Olympic athlete Darren Campbell will be leading a half-time penalty shoot out. The pre-order food app has now been extended to North Stand and south end of West Stand. Full details here http://www.leytonorient.com/news/article/pre-order-app-extended-1417424.aspx
AWAY FANS: Away supporters will be situated in the East Stand on Brisbane Road
TRAVEL INFORMATION: For all the information about getting to The Matchroom Stadium visit as well as parking: http://www.leytonorient.com/news/article/matchroom-travel-231213-1252797.aspx
Please note there is very limited parking in the surrounding area.