The final destination will be decided this weekend when they go head-to-ahead with vastly-improved Whitehaven at Hilton Park on Sunday, kick off 3pm.
The clubs have the best defensive records in the league and, just as in their last meeting on Easter Monday when Leigh edged it 19-12, there's likely to be little between the sides.
"I'm expecting a tough tight game," says Terzis. "Whitehaven have made it difficult for every side they've played this season and I've no doubt Sunday will be the same. It's a huge day for them. They've not been in too many finals so they'll be busting a gut come Sunday.
"But we're used to handling pressure situations and if we stay focused, we'll get through to the final."
Leigh's biggest concern is John Duffy who is still struggling to shake off the knee injury that kept him out last weekend.
The Centurions will also be without Dale Cardoza who has been suspended for three games and fined £150 for illegal use of the forearm in the defeat at Oldham 10 days ago.
Executive director Derek Beaumont is asking the fans to come out in large numbers for Sunday's game.
"The fans can be our 18th man - the difference between winning and losing. The players love it when the crowd gets behind them and they respond on the field," he said.
The club will continue with their experiment of laying on Super League style pre-match entertainment on Sunday.
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