Nasri feels Arsenal are agonisingly close to finally ending their quest for silverware following a sixth barren campaign - and indeed can rival Barclays Premier League champions United for quality.
He said: "At some point, we so want to win, our desire is so big that we rush things and make mistakes. But it is not because we are scared, but because we want to win so badly and we don't think enough.
"As a team, we all realise now what we need to do to win a trophy.
"We had everything to be champions, but if you look at it, every time we played to go top of the league, we never did.
"In terms of talent, I feel we had the best squad of the whole league. We played the best football.
"We were the best team, even if Manchester United had a good season too."
Nasri added: "We have improved so much.
"If the boss adds some good players, I really believes a trophy will be won."