Berbatov told A Bola: "Yes, he was phenomenal in Portugal."
He added: "I'm a little jealous, to be honest. Sad and even disappointed because he did not go to United, because there was even a Portuguese connection. But he chose Arsenal. In a way, I get it. Arsenal are playing well, play good football, with pass, pass, looking for spaces. Mikel Arteta is a student of Pep Guardiola and that's how he plays, he's never going to change.
"Gyokeres will have opportunities to make his mark there, for sure. And the first game of the season will be a test for everyone: Amorim against Arteta, United against Arsenal, Gyokeres against Sesko — United’s new 9. Therefore, you can already see some interesting duels on the field."