Time to bring up Asiata and see if he's improved enough to stopgap. If nothing else, he can run block. Otherwise, maybe Sterup can play a little Guard? I know he's huge and might have trouble with the bend but there's nobody else that encourages optimism (I have little faith in the corpse of Ted Larsen).
Out of left field, we could kick Tunsil inside for a couple weeks if Sterup is as good on the left as coaches have been saying all this offseason. But I could 100% get that they would not want to risk retarding Tunsil's progress.