He said: "I am not afraid to talk about my ambition. These are the two decisive weeks of the whole season. That is very clear. But sometimes you have to accept that you don't have full control over the result.
Arsenal were beaten at the last-16 stage on seven consecutive occasions between 2011 and 2017, which featured three defeats to Bayern Munich and two to Barcelona.
Reports on Tuesday said Juve CEO Beppe Marotta had negotiated with Napoli president Aurelio De Laurentiis to pay the transfer fee over two instalments.
He wanted assurances over Atleti's ambition in the transfer market, though felt it would be easier to win the title with Barca, and he seemed deeply affected when he was booed in the final La Liga match of the season despite a man-of-the-match
He challenged the Old Trafford side to show ambition if he must stay for next season. The Swede is in talks about extending his contract for another 12 months, although he has an offer to move to the Major League Soccer with LA Galaxy.
"I know Edu, I know Raul, I know the quality of the team, the players, and that's what makes me excited to dream, to have the ambition to win big things. "I think all my life, I've always started the season with the goal to win things.