Ambrose believes Palace can shock Aston Villa in tonight's FA Cup tie
The 25-year-old midfielder scored a fantastic free-kick in the first game at Selhurst Park to put his side 2-1 ahead with only a quarter of the match remaining.
But Stiliyan Petrov's late equaliser earned the Premier League giants a second bite of the cherry.
Most people have now written off the Eagles chances of progressing to a quarter final tie at either Reading or West Brom, but Ambrose believes his side aren't beaten yet.
"We know we can give them a good game and as long as we stop what they are good at I think we will be alright," he said.
"That free-kick was one of the best I've scored and I would love to repeat that [tonight], but the most important thing is that we get through.
"Their set pieces at Selhurst Park were the thing that destroyed us so we have got to be aware of that. But we know what they are about now, they have got late runners coming in that if they get good contact it's going in.
"But we are usually pretty good at defending corners and free-kicks and we're confident we can handle them."