New Zealand wicket-keeper Brendon McCullum was taken to hospital for an X-ray on his forearm after retiring hurt while batting on the final day of the first Test against England at Lord's here on Monday.
McCullum, on 11, was struck on his left forearm by a rising ball from fast bowler Stuart Broad and, after several minutes of treatment, left the field.
His absence was a major blow to New Zealand who, at that stage, were 120 for four in their second innings - a lead of just 78 - in the first match of this three-Test series.
McCullum, one of New Zealand's leading players, had rescued his side from the depths of 104 for five in their first innings with a run-a-ball 97 that helped them to a total of 277.
The second Test starts at Old Trafford on Friday. Should the 26-year-old McCullum fail to recover, New Zealand do have a reserve wicket-keeper already in their squad in Gareth Hopkins.