The ex-Valladolid shot-stopper earned a transfer to Old Trafford after an impressive season that saw him drafted into Spain's World Cup squad.
Despite not making his debut for The Red Devils, the 30-year-old is stunned by the way he has been treated so far at United.
"From the moment I arrived at the airport, everything has been devoted to ensuring I only worry about playing football," he explained.
"This is the NBA of football.
"Everything is geared towards playing football.
"Sometimes I stop and wonder if this is really happening to me."
Now he is desperate to make his debut appearance in the Manchester United first team, after playing in the reserve team's defeat to Everton on Wednesday.
"The stadium is spectacular," he added. "As soon as you arrive everyone wants to speak to you requesting autographs."
Ricardo knows that he will have to wait and prove himself after Fabien Barthez made his return to first team action against Middlesbrough in midweek.
"I will first play in a friendly with the reserve team so I can get to know English football and gain the level needed."
The question was raised as to whether a move away from Spain would damage his chances of further international recognition, but Ricardo has no doubts he has made the right move.
"When I was asked to make a decision about moving to England I knew that this was a step up in my football career and do not believe that it will prevent me from being picked for Spain again."
