Manchester City are determined to keep their distance from Arsenal who have led the standings so far for so long. Arsenal has 1 other match that has not been played so the points will probably be 8 points different from Manchester City. So winning is mandatory for Pep Guardiola and his team, there are no excuses.
There is absolutely no excuses for Pep and City, i think if they lose any game in the EPL right now, it would give Arsenal an unassailable lead at the summit of the EPL table. The good thing about Arsenal's lead at the summit is that they can afford to lose one or two games and still remain where they are, but every game for City from now going forward is a must win.
Having said that, Pep's boys already beat Spurs 4-2 about a week or so ago, they had to wrestle back to get all three points after trailing by 2 goals to nil; i am pretty sure Pep wouldn't want his team to concede cheap goals like they did in the first leg, thus i think City might win this game pretty easily, in the same weekend Arsenal play a relegation threatened Everton, definitely City know they have to win because Arsenal will most likely win.