He'll be fine. He can't clean or snatch (if they even do snatches) but Woicik can have him do something explosive with some type of squat or even leg press.
Or they might not even worry about it at this point. Only a few weeks left in the season anyway, so he wouldn't lose any significant amount of strength in that time. Right now everyone on the field is tired and beat up anyway and it's mostly about mental toughness at this point. Which we know Dez won't lack.
Jason Garrett offense rank minus Tony Sparano: 18, 14, 7, 15, 15