Di Vaio joins the club under MLS's designated player rule which was created to allow for high-earning overseas players, such as David Beckham, to come into the league and be paid mostly from outside of the team's salary cap.
"I have accepted with great enthusiasm the challenge of joining an enticing championship like MLS. I am extremely eager to make the entire club proud from the president to its supporters," Di Vaio, who made 14 appearances for the Italian national team, said in a statement released by the club.
Montreal are currently eighth in the Eastern Conference with three wins from their opening 12 games.
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