The 21-year-old was sent to the Spanish side on a season-long loan basis last summer and, in spite of what was a terrible season for Granada, enjoyed a hugely beneficial nine months during which he made 37 appearances.
And Robson, speaking the to club’s official website, noted that the Brazilian could make a big impact on his return.
“It will be interesting to see how he does when he returns and I think we’ve got quite a few good young players who, next season, have got to step up a little bit more and prove they can be Premier League players week in and week out.
“They’ve always got to remember it’s not just a one-off game but they have got to come in and handle it – mentally and physically every week.
“When they’ve been around the first-team squad for a couple of years and keep doing it, then that’s the time to say they’ve really arrived at Manchester United. There is still a lot of hard work to be done for those kids.”
Pereira learned a number of valuable lessons with Granada: he experienced losing on a relentless basis; the Camp Nou and Lionel Messi skipping through players at will; an entirely new culture.
Most importantly, however, he experienced the daily grind of life as a professional footballer with a senior side – the nine month marathon with 25 other players and, in his case, three managers. He may still be just 21, but he will embark on Carrington with a wealth of experience to call upon.