Bielsa says two key players could made Sunday's game.
"Pascal Struijk has a knock around his hip, but we think he'll also be available."
On facing Brentford, the Leeds boss added: "A team that always attacks with six players. They have a general rush to be protagonists and they always try to keep the ball.
"Anyone who has seen Brentford play this season can see they attack with six players and try to keep the ball, that's not common in any league and even more so when that team is not in the most prestigious clubs in the league."