Arsenal come into the match off the back of three huge games, with the last of those at Chelsea on Sunday, in which manager Mikel Arteta salvaged a draw after going 1-0 down thanks to a Trevor Chalobah header.
An easy win for Arsenal
After dropping points, Arteta will be hoping to see his side bounce back against the Bees as they aim for 3 points, which would bring confidence back to the side
Speaking to Snabbare, Petit predicts an easy win for the Gunners as they aim to extend their lead at the top of the table.
"Arsenal must win at the Emirates. When I look at the schedule of the upcoming games until Christmas, they have so-called easy games. This is an opportunity over the next five games to increase the gap with the top teams in the Premier League. So, definitely a victory for Arsenal.
"I would say Brentford can be a nuisance sometimes, but I don't see why Arsenal would drop points. I would probably say something like a 3-0 win."
Chelsea must win
Meanwhile, Chelsea will be looking to continue to pile the pressure on Arsenal as they aim to gain back their spot in second place after Manchester City jumped above thanks to a win against Leeds United.
Petit gave his predictions for the Blues who he says must collect 3 points or kiss their title hopes goodbye as the gap widens between them and the top.
"Leeds vs Chelsea is never easy. Playing against Leeds at home is a battle, but come on, Chelsea have to win now. They have to show that they are fighting for the title, too. They cannot afford to drop points because they are pretty sure that Arsenal will win against Brentford.
"Can you imagine if they drop points? That would probably be an eight or nine-point gap. I know it's not a huge gap in the Premier League because we are not even at the halfway point, but it goes very quickly in both ways in the Premier League.
"But I see Chelsea winning. Cole Palmer will score. This is a typical game for him to score goals."