The pair played together for the Bianconeri.
"Antonio Conte is a special person with great charisma who had an incredible effect on the team," said Legrottaglie.
"I knew Conte as a colleague, a friend and as an assistant manager at Siena. You could tell he had that fire within him, so he is doing so well at the level he belongs in. So we'll win and then I invite Conte to dinner for my Mum's home-cooked meal."