Separated by three points, there is also the possibility that the three clubs, occupying third to fifth place in the Premier League, even face a playoff to decide who qualifies for the top-tier competition or the Europa League.
The rules state: “If at the end of the season either the league champions or the clubs to be relegated or the question of qualification for other competitions cannot be determined because two or more clubs are equal on points, goal difference and goals scored, the clubs concerned shall play off one or more deciding league matches on neutral grounds, the format, venue and timing of which shall be determined by the board.”
As it stands, their goal difference and goals scored are similar enough to raise the prospect of two teams finishing joint third or fourth.
City just need a point from their match at Watford to seal fourth spot.
That would put them out of reach of the Gunners, but they may still face a playoff with Liverpool.
The Reds host relegated Middlesbrough and anything less a win could see them overtaken by Arsenal.
The fifth-placed Gunners face the toughest fixture as they welcome Everton to the Emirates, which is in a state of revolt after just 40 000 fans showed up for their 2-0 win over Sunderland on Wednesday night.