With the BBL final in danger of being washed out, star players have called for a reserve day to be introduced in the case of wet weather.

Forecasters are predicting up to 50mm of rain in Sydney on Saturday, with the SCG locked in to host the decider - and the bushfire relief match curtain-raiser.

The Sydney Sixers will play the winner of Thursday night’s preliminary final at the MCG between the Melbourne Stars and Sydney Thunder.

Five overs per-side have to be played to constitute a BBL game and the team that has earned the right to host the final is declared the winner if the competition showpiece is abandoned.

Sydney Thunder captain Callum Ferguson is against shifting the final away from NSW, but thinks a wash-out would be a disappointing end.

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Adam Zampa says the Stars can bounce back from their recent run of outs. Credit: AAP

“I feel like the integrity of cricket is of foremost importance to this tournament,” he said.

“The fact the Sixers have earned the right to host, I don’t believe we can afford to start mucking around with that sort of stuff.

“But I absolutely believe there needs to be a reserve day.

“I believe we’ve got the right (finals) system, barring a reserve day, and we need to make sure we give it every chance of being played.”

If the Stars progress to the decider and the game doesn’t go ahead, they will suffer more finals heartbreak after finishing the season on top of the ladder.

They have made the finals in eight of the nine BBL seasons, but are one of only two teams - along with Hobart - who are yet to win a title.

Rain affected the BBL match between Sydney Sixers and Hobart Hurricanes at the SCG on January 17. Credit: AAP

Legspinner Adam Zampa said the Stars weren’t looking too far ahead, but would hate to see a no-result fixture decide a tournament.

“With the length of the Big Bash, it’s a bit disappointing there isn’t a spare day or two,” he said.

“We can’t really control it at the moment. If the final comes around, even if it is five overs, hopefully there’s a game.”