"I was immensely surprised to hear the news of Sir Alex Ferguson's retirement today," said Andre.
"His contribution to the game has been second to none, his achievements outstanding and his impact on sport in general is a unique example of his class.
"He is the finest manager in world football and his legacy and achievements are something that we can all cherish and admire for years to come.
"I really wish him all the best for the future."
Ferguson has amassed a total of 38 trophies during 26 years at Old Trafford including 13 Premier League titles, five FA Cups and two Champions League crowns.