The probability that Arsenal loses tomorrow's game against Brentford is quite minimal. If they lose yet another game, it will be clear that they are not prepared to hold the title of Premier League Champions for this year. They are aware of what would be at risk for them if they lost against Brentford. They won't be as fortunate this time around as they were last week to see Manchester City lose their match as they did to Everton. They will get to see how Manchester City will overpower them to lift the PL title again if they lose other of their matches by mistake.
Arsenal will not lose to the Brentford team, Arsenal will provide resistance and it is likely that they will take advantage of the opportunity in this match to score lots of goals in order to get additional points that can make them even further away from the second position from the top of the standings so that Arsenal will remain safe in first place until the end of this league.
Arsenal will play to win in order to keep their title hope going because any result apart from 3 points for Arsenal will bring a big problem for the team because they will no longer have the motivation as seen since the beginning of the season. They have the advantage because they are playing at home and they need to utilize the opportunity to be ahead of the City with more points and get their fans the hope of believing in them again after losing last week against the Everton team in the league and against Manchester City in the cup game. This game will determine the chances of Arsenal winning the league with ease or struggle.