But Mourinho believes there are as many as seven candidates to challenge for Chelsea's crown in the coming campaign.
"You know, he's injured, he needs time to recover", the United boss said. "I have to try to win every match".
Alongside assistant coaches Rui Faria and Ricardo Formosinho, the United manager wore an Adidas tracksuit and appeared relaxed ahead of the return of the Premier League.
"I'm not going to lie, this is a big week and it is game time", he said.
But the Belgium worldwide failed to convince Mourinho during their time together at Chelsea and will be playing in the Champions League proper for the first time.
However, the club did win the Europa League and the League Cup, giving the manager a platform of success on which to build. "It's obviously more hard to win the Champions League, also because the motivation is higher".
"But he's also very humble about himself, he's also still learning the country and Premier League, and hence that's why he's brought in the level of players he has".
Much of their season was marred by defensive issues which they will be hoping to have fixed in the upcoming season.
"We have more experience of working together than we had last season".
March believes that the high transfer fees are a reflection of the quality in the league but says Brighton are not intimidated by bigger teams or anxious by the general consensus that they will be relegated after just one season.
With the exception of Luke Shaw, Marcos Rojo, Ashley Young who have all been carrying injuries since the back-end of last season, everyone is fit and ready to be involved on the opening day. "We thought we've made this 16-hour journey to watch the match, we may as well watch the medal presentation and see the players on their lap of honour", Ibrahim told ManUtd.com. I think it will be a draw.
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