Villa came from behind to win 3-1 as Morgan Rogers, Moussa Diaby and Leon Bailey struck for the hosts.
Afterwards, Emery was delighted with the win after their trip to Lille on Thursday.
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He said: "Big effort because fifth place is not Champions League, because English teams lost it. We have to get fourth. We have to be demanding and prepare as well as perform.
"We have to be focused more than before because we thought fifth was Champions League, but now it is not.
"Tottenham have two games in hand and then of course we have to be in Conference League (semi-finals)."