Lewington played under the Italian for the 2008-09 season.
"Heâ€™s the best manager that Iâ€™ve had at MK Dons, his all-round skill set," said Lewington, the MK Dons captain. "Weâ€™ve had some very good managers here, Di Matteo and people like that. Karlâ€™s quite far ahead of where he was at the same time.
"For such a young manger Karlâ€™s very focused and doesnâ€™t stray away from his principles. He sticks to his guns. If we donâ€™t score weâ€™ll keep passing it, whereas some people change their mentality."