Mark Chapman has been called into the New Zealand squad ahead of the second one-day international against England after doubt about the fitness of skipper Kane Williamson.
A hamstring injury threatens to sideline an out-of-form Williamson from Wednesday's match at Mount Maunganui.
Coach Mike Hesson says the 27-year-old skipper will undergo tests, and will have to prove his fitness if he is to play.
"This is just a mild hamstring strain but it's one that obviously he's got to make sure he's 100 per cent ready to go."
Williamson has been below his best in the past month, dismissed for a single-digit score in seven of his last eight innings.
That includes a scratchy 23-ball knock for eight runs in the three-wicket opening win in Hamilton on Sunday.
Former Hong Kong international Chapman, 23, has shone at domestic level this summer and produced some bright cameos on debut for New Zealand in the Twenty20 tri-series.
Seamer Tim Southee will be the captain if Williamson is ruled out.
