Before leaving for Granada on-loan, Pereira was at United as Pogba was re-signed from Juventus.
"Pogba arrived and it was kind of weird, it seemed like he had returned from a very long vacation," laughed Pereira with GloboEsporte.com.
"It is quite different with the arrival of (Jose) Mourinho, everything is more focused and prepared to play . The new players will help the team a lot.
"I think this year Manchester United will shake things up."