It was Guardiola's final appearance as coach at the Nou Camp.
"We're in an era where Barça have learned to win and lose, where we also pay homage to our heroes," said Rosell.
"It's important that our heroes can leave through the front door. We've matured as a Club and as supporters.
"The Camp Nou clamored for Guardiola. Pep we love you. We can't say anything else. It was fantastic."