There's a good chance he could be a starter, but Douglas Costa will also probably be starting shortly.
I think it probably says more about the experience, conditioning, and footballing IQ of Matuidi. He's somebody that Allegri knows he can immediately trust to follow directions, and get the job done.
Love that video above, and all the kind words from the club. Definitely have acquired a well loved guy in the locker room, and a true professional. Certainly bodes well for us!