The Blaugrana president has praised the stand-in coach and dismissed suggestions that the side's standards have slipped in recent months
The Blaugrana assistant was criticised following back-to-back Clasico defeats to Real Madrid and the Champions League loss to AC Milan.
But after masterminding a stunning 4-0 win in the second-leg of that last 16 tie and steadying a ship that appeared unsteady for a brief time, Rosell has moved to praise his work.
"For me Roura has been a hero, despite knowing that some people say I exaggerate," the 49-year-old told Mundo Deportivo.
"He has done extraordinary work and has demonstrated loyalty that is rarely seen in people today. He has done his job very well and so far has earned his salary, but that does not mean he will receive a bonus."
Rosell then added his belief that the Catalans remain the best side in the world and rubbished suggestions that he had grown concerned following a rocky February for the club.
"If the question is from the point of view of those who began to doubt [it makes sense], because I did not remove any burden," he replied when asked whether victory over the Rossoneri took a weight off Barcelona.
"If it is from a sporting point of view, because I want to win with Barca, the players were more animated, especially to make sure Tito [Vilanova] had the best reception on his return- that took a thousand kilos off us.
"But if we're talking about a crisis, institutional or in terms of values, I could not see that anywhere because there was no burden to remove. Barca is still the best team in the world.
"I think this story is more to do with the media than reality. These things do not interest me."