Gabriel has been linked with Inter as a replacement for Lautaro Martinez.
Mattos said, “He would undoubtedly be a great signing. We are talking about a top player and an exemplary professional. If Inter manage to catch him, the team's technical quality will undoubtedly increase."
Mattos also revealed Inter made an attempt for Gabriel before he joined City.
"We had two meetings with Inter and their offer was €45 million," he told FCInterNews.it.