Ten Hag has an excellent record against Emery since joining United, winning four of their five encounters, and he may need to make it five out of six to keep his job.
He said: ‘Wednesday was a fantastic day and the fans were very happy but now I want to win on Sunday. I have the same ambition since I arrived here.
‘We have to be demanding in every match. Maybe we achieved certain objectives, like Champions League football, sooner than we were expecting, but the example I have is to be demanding and not to relax.
Unai Emery wants to see his Aston Villa squad continue their stunning start to the new season against Man United
'Being consistent in the Premier League is the first objective we have.
‘I have to respect Erik ten Hag because he has beaten me more than I have beaten him. He won the FA Cup last year, beating Manchester City in the Final, which is very difficult. He is a very good coach.
‘At Manchester United there are huge demands to achieve a lot of objectives but he is in a process. They are an experienced group of players. They are not achieving consistent results in the league but in one game, they can show their quality with a huge performance.
'I will prepare the match more than I did the Bayern game. It is a winning club and it is still a group of winners.’