New Zealand's hard road to the Cricket World Cup final will become impossible if they don't hold their chances.

The Black Caps will face off against hosts India in tonight's semi-final in Mumbai at 9:30pm.

There's controversy brewing ahead of the match, with reports claiming India have switched the pitch to favour their spinners.

Former Black Cap Peter McGlashan says this is a sign India feels threatened by the Black Caps' chances.

"It's one of those things where it's difficult to do late, so I would be surprised if the New Zealand team probably knew about this a day or two ago. Generally when you arrive at a ground to practice, you're shown where the match will be played."

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