Fla bought the striker outright this week.
"We are very happy to have completed the outright purchase of Pedro, we had been working on it for a long time time," said Landim.
"Obviously it wasn't easy and it took some time, but we finally managed to find an agreement: today we are proud to announce to our fans that Pedro is and will be our player for a long time.
"We immediately told Fiorentina that we wanted to keep him here. Pedro in the last year has offered some great performances with the Flamengo shirt. He quickly won the hearts of our fans and we are really happy that things have gone the right way."
He concluded: "Pedro is now one of our players in all respects, we can only be proud and satisfied."