Aston warns Saints
Saints are top of the Super League and the Catalans near the bottom but Aston knows about shock results.
He was man-of-match when the Eagles turned over the might of Wigan 17-8 at Wembley in 1998.
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Aston said. "Look at the Catalans team - it's is full of international class players from Australia and France.
"I don't think it is going to be a walk-over. A lot of people are expecting St Helens just the turn up and win the game - but a few expected Wigan to do that in 1998!"
Catalans appearance in the final is a massive boost for the 13-a-side code in France. They have reached the final after only two seasons in the Super League.
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Hide AdBoth sides have big sets of forwards and in Kiwi Stacey Jones the Dragons have on his day the most exciting half-back in the game.
Jones delayed his retirement to play in France and his clash with Saints' Great Britain star Sean Long could be a classic
Aston said: "A big thing for the Catalans is that they beat Saints 21-0 a few weeks ago - that's a massive result - not many, if any teams, have nilled St Helens over the last few years.
Aston, who will be taking part in a parade of players who have won the Lance Todd Trophy for their performance in a final, added: "It's going to be a good final."
The game is live tomorrow on BBC TV (3pm.)