The Buddies claimed their first silverware since 1987 when they defeated the Jambos in the Scottish Communities League Cup final in March.
McAusland knows Hearts will be keen to make amends for the defeat at Hampden but backed Saints to claim the point they need to secure their SPL safety.
He said: "They will want a bit of revenge for the cup final. It's always tough going to Tynecastle.
"They have big, strong players. They are a good team. If they turn up on the day, they will give us a right hard game.
"But, hopefully, if we play the way we know we can play, we can get the job done."
- Sports & Recreation