They beat Celta Vigo 1-0 in the first leg of their Europa League semi-final in Spain on Thursday and go into this week's game at Old Trafford with a great chance of meeting either Lyon or Ajax in the final.
Granit Xhana's heavily-deflected strike was followed three minutes later by Danny Welbeck's header against his old club to give Arsenal a 2-0 victory, ending Manchester United's 25-game top-flight unbeaten run.
Mourinho said their cramped schedule, which includes a possible two further Europa League fixtures, meant United must win the tournament to qualify for next season's Champions League.
Arsene Wenger has said that Arsenal's first Premier League victory over Jose Mourinho has helped his players get over their defeat last week at Spurs.
"I don't think so [that the result will have an effect on Thursday's second leg] because of the fact there will be so many changes".
Still sitting six points away from a top four position though, Wenger says that the luck will need to be on their side in the final weeks if they are to feature in the Champions League next season.
Kerala Congress got hurt during UDF rule
Mani also dismissed the UDF's threat that the KC (M) had closed the door to returning to the UDF by aligning with the CPI (M). Eight KC (M) members supported Congress candidate Sheela Thomas who was elected as the vice-president of the panchayat.
"It is the first time I've left Highbury or the Emirates and they are happy". The Gunners will continue their pursuit of a top four finish, after Sunday's victory breathed some new life into their hard Premier League season.
Mourinho however said he is does not enjoy seeing the north Londoners fail to win big trophies. "We had just one blip but overall we look a bit more stable".
Neville thinks seeing Mourinho smiling and laughing during post-match interviews proved his focus was always elsewhere as he discussed the decline in importance of the Arsenal v United fixture, once the biggest game in English football. I really don't care about it [the record against Wenger].
"We started a bit nervous and under pressure but slowly we became better and, in the second half we controlled well the game", Wenger said. We have four games left that we need to approach in the same way as today.
"Today, no problem. We shook hands before and after the game". They had a couple of chances in the first half but so did we and ours were the big chances.