Right before playing their missing game against Brentford, Manchester City are going to host Chelsea in two days. Winning this game is really important for the Manchester side. Because as long as they keep up with Liverpool until the Brentford game they will have a huge opportunity to take the lead.
I don't expect Liverpool to lose points against Brentford either. But their hands are tied about keeping the lead on one hand as I said. They shouldn't have lost to Arsenal.

From now on they will need to win as many games as possible until facing Manchester City in a critical game for the title.
Liverpool still have hope, but on the condition that they must sweep all matches with a win, it is something that is mandatory. In terms of points, let's say they are below Manchester City by 2 points, because Manchester City still has a match they haven't played. The meeting between these two teams will be very decisive later to determine which position is the best between them.
Brentford is not a very tough team, even so Liverpool should not underestimate this team, because they could give a big surprise that could make them swallow defeat.