Boult, who took 1-97 in the first innings, bowled just one over on the fifth and final day in Mount Maunganui before leaving the field.

The fast bowler will have an MRI scan on Tuesday, with the second and final Test of the series starting on Thursday (22:00 GMT).

Despite losing Boult, the Kiwis won the first Test by an innings and 65 runs.

If left-armer Boult, who has taken 255 Test wickets, is ruled out he is likely to be replaced by the uncapped Lockie Ferguson.

'The effort had to be huge'

Having lost the toss in Mount Maunganui, New Zealand reduced England to 353 before posting 615-9 thanks to a double century from BJ Watling and a maiden Test hundred by Mitchell Santner.

They then bowled out England for 197 in the tourists' second innings to seal a convincing victory on a flat wicket.

"It was an outstanding effort after losing the toss to restrict them to 350," said Black Caps captain Kane Williamson.

"That's still a pretty good first innings score and you have to play extremely well to change that momentum but we did that thanks to BJ [Watling] and Mitchell Santner and some other contributions.

"Batting second meant the effort had to be huge and that meant trying to bat for 200 overs.

"It wasn't the initial focus, we knew that was a long way away, but for guys to make the right decisions for such a long time to give us the opportunity to bowl at England was a superb effort against a very good bowling attack.

"It was a great game of cricket to be a part of. It was an outstanding effort against a very tough England side."