Yeah could be a good option from the bench, I would start Sanchez left, Rashford not done enough to warrant getting in ahead of him (although Sanchez has done sod all but wouldn't play him out of position to accommodate Rashford)
I think he might start Mata, hope not as we could do with pace for the counter.
My guess would be Sanchez & Lingard on the wings if Martial is out then he'll have Mata/Rashford as his impact players off the bench depending on how it's going.
If we are playing counter attack you can't start Mata because he can't carry the ball long distances which is sort of what you need the wide players to do, Willian is brilliant at that for Chelsea.