NSW Premier Nathan Rees has all but ruled out pouring $45 million of taxpayer money into a stadium for the new Greater Western Sydney AFL side.

Mr Rees said the AFL has been asking the state government for months to contribute the funding to improve the Sydney Showground at Olympic Park.

But no money has been committed to any upgrade and the premier indicated it was unlikely to be forthcoming any time soon.

"I'd rather put the money into schools and hospitals quite frankly," Mr Rees told reporters.

"That's what I've said publicly. That's what I've said to the AFL."

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