As others have said, I would be very surprised if Tomlin starts a game under MM. He is just not the type of player to close down the opposition, which seems to be the mainstay of MM's tactics so far. However, if we're chasing a game and look like we're running out of ideas, a fully fit Tomlin would seem to be the ideal solution. So yes, I believe he does have an important part to play, just not as a starter