The three-time title winner did think Tottenham would be able to challenge Liverpool and City, and City’s B team, for the trophy, but amended his original prediction ahead of Spurs’ trip to the Emirates.
Liverpool currently lead the table after City and Tottenham dropped points in recent weeks and Mourinho has now delivered a new prediction.
‘I think both [Arsenal and Tottenham need the points]. We were having a laugh at Old Trafford in the first fixture of the season,’ Mourinho said on Sky Sports.
‘I was having the joke of Man City B, Spurs, Liverpool and Man City [challenging for the title].
‘Just three or four weeks later, we understand clearly Liverpool and Man City are going to finish first and second, or second and first.
‘Can Tottenham or Arsenal be there? They push for it, I think today is very important for them to win.
‘If they don’t do it, the distance just after four weeks is the distance that impresses a little bit.’
Tottenham can go level on points with Arsenal with a win against their bitter rivals, while the Gunners could go third with a victory.
Once the London Derby is decided, clubs action will be put on hold as the international fixtures take over.