Villa v Man Utd injury news: Kozak/Luna back in training
But skipper Ron Vlaar remains an injury doubt as Villa prepare to take on the reigning league champions.
Luna and Kozak missed the defeat at Fulham with groin and toe injuries respectively, while Vlaar was forced off with a calf problem during the victory at Southampton nine days ago.
One man who will definitely be absent for Sunday's game is midfielder Fabian Delph, who is set to serve a one-match ban after picking up a fifth booking of the campaign at Craven Cottage last weekend.
"Most of them are back," said boss Paul Lambert.
"Ron Vlaar is still struggling. Fabian is suspended.
"Luna trained this morning so hopefully he'll be ok. We'll see how he is tomorrow.
"Kozak trained as well. We'll see how they are.
"Fabian is suspended which is a blow but we'll change it and I'm sure whoever comes in will do pretty well."
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