The defeat in the season’s curtain-raiser represents the first time Mourinho has tasted defeat at the hands of long-term nemesis Arsene Wenger in 14 games, with Alex Oxlade-Chamberlain scoring the game’s only goal.
Mourinho believes his Chelsea side was “the best team” despite the defeat, which saw Chelsea enjoy 14 shots to Arsenal’s 11, a comparison which becomes two to five in the Gunners’ favour when looking solely at attempts on target.
The Portuguese was also quick to criticise the state of the Wembley pitch, as well as the weather, for the defeat.
“One team played counter-attack football well,” Mourinho told reporters. “One team played with initiative well but without the sharpness you need to be more aggressive with the ball. The team tactically tried everything.
“My opinion is the team that defends very well, that leaves their philosophy in the dressing room, changes their attitude, plays all the second half with nine players in front of the box, doesn’t concede and scores one goal, from that perspective they deserve to win.
“The best team lost, the team with more initiative, that wants to create more lost. But this is football. This is very good tactical organisation. Congratulations to them.
“The pitch was a disaster, so slow, the weather didn’t help too but it was the same for both teams so no excuses. I know Arsenal also like a good, fast pitch.
“I expected the lack of sharpness, it’s normal. Some players like (Radamel) Falcao started a week ago. The others have had two weeks and half of this week.
“Arsenal defended with 10 players, they put everybody in front of their own line and they had good organisation, congratulations to them.”
After seeing Diego Costa withdraw from the matchday squad in the morning due to a recurring hamstring injury, the boss insisted he remains happy with the strikers at his disposal, with just Falcao and Loic Remy, who played the first-half, representing his senior forwards.
“Two days ago (Costa) was ready to play. When I told you two days ago he was ready to play he was ready to play.
“He trained normally on Friday and yesterday at the end of the training session he said he was not feeling good.
“But Falcao will have had a bit more football, he will play against Fiorentina from the start. We have (Loic) Remy too, so if we don’t have Diego I am happy with the strikers I have.”
Mourinho was then queried over his relationship with managerial rival Wenger, with the two bosses notably not shaking hands after the game, despite the Chelsea supremo embracing every Arsenal player.
“I was doing what the status of my club and my status as a manager what I have to do: Wait for the winners in a way where you only miss me when you want to miss me.
“Every Arsenal player came in my direction which was the easiest thing to do because I was right there. If other people didn’t come in my direction it’s not a story.”
Asked about losing to Wenger for the first time, Mourinho said: “I never had a psychological edge. It’s not normal what happened before, and because it’s not normal I never paid attention to that.
“I always thought one game is one game and has no relation with other games. Thirteen matches is an eternity. It has never been a question of beating someone and losing to another one.”
Mourinho conceded that retaining the Premier League title was a huge ask for his charges this season, telling reporters: “This season the Premier League title is very difficult but it is very difficult for everyone.
“The way other teams are spending they have big power in their hands while we are the same as last season. And with that we are going to try.”