Villa claimed a 4-3 victory at the Amex Stadium the last time these two sides met two months ago.
Emery’s side have only won two of their last seven top-flight matches in a statistic that does not bode well for their top four chances.
Emery’s side sit third in the Premier League table and nine points behind leaders Arsenal, and must start to pick up points as the likes of Chelsea and Manchester United catch up.
Emery isn't thinking about the Champions League
He first spoke on how secure he feels in the Champions League places, with an eight-point cushion over sixth-placed Liverpool.
"We are not thinking about the end of the season. We are thinking about now. We cannot speak about how we were in September. We are enjoying the process, and we are competing. We are feeling comfortable with how we are doing our season. Up and down sometimes, but more up than down.
"Now we've had two defeats at home and can understand how something like this can happen.
"Tomorrow we have a new challenge, at home at Villa Park, to try to get our full energy, our full wishes and our focus to prepare the game and compete against a very good team.
"And to compete at Villa Park with our supporters, which is always very special for us to play there."
Sancho to stay?
One player who has impressed this season under Emery is United loanee Jadon Sancho, a player the club could snap up for free when his contract expires at the end of the season. Emery was asked if the Englishman could stay, and implied that he must impress for the rest of the season.
"Not yet (no updates on his future). But he's a fantastic player. Hopefully, he can help us increase his qualities in our structure, like he is doing.
"Of course, he will need another contract. Will it be here? It could be because if he is playing his best football, we will want him. But if he's playing his best football, then maybe another team will want him.
"This is football. Each match, the next match, this month, everything is very important for every player."
Villa have won seven of their last nine Premier League encounters with Brighton and could extend their gap on United to six points with a win, depending on how the Red Devils perform against West Ham United.
