If Dummett is out then would Clarke not be the preferred choice at LB? He's pretty decent going forward with the ball and a good defender.
Probably - but that then leaves us light at centre half. Would almost be tempted to go three at the back at the moment Atsu at left wing back Clark, Lascelles, Mbemba Manquillo at right wing back Hayden, Ritchie, Merino Gayle, De Jong (or whoever else we want to play at 10)
Hell, we've played with less than 3 at the back for years. What with Saylor, Willo, Colo we've been lucky if we've had 2 at the back never mind 3.