If Williamson, who scored a career-best 251 in the first match at Seddon Park in Hamilton, is named at the toss on Friday he cannot be replaced should he have to leave the game, Stead added.

"He is very valuable to us and not just for the runs he scores," Stead said.

Wicketkeeper BJ Watling returns to the side and Tom Blundell will move up to open the innings with Tom Latham after he dropped down the order and took the gloves in Hamilton.

Will Young is likely to drop out while Devon Conway, who was brought in as batting cover, has been released to play for New Zealand 'A' in Nelson.

Steady rain in Wellington since the weekend meant the teams have not had a proper look at the pitch, but Stead said it was likely they would go with four pace bowlers again.

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The only likely toss-up decision to be made is whether all-rounder Daryl Mitchell or left-arm spinner Mitchell Santner takes the final spot.

"We will make that call when we see the wicket," Stead said.

"They are normally good wickets at the Basin and have good bounce and carry so hopefully if our seam bowlers bowl well they will have a big influence on the game."

Reuters