New Zealand bowler Southee suffers thumb fracture, World Cup campaign in doubt
"An x-ray has confirmed that Tim Southee dislocated and fractured a bone in his right thumb while attempting to take a catch in the 14th over of the 1st innings," NZC said in a statement.
"A timeline for his recovery will be established tomorrow when he undergoes further assessment."
NZC added that batter Finn Allen, who also picked up an injury while on the pitch as a substitute fielder, had been "cleared of any fracture or break".
New Zealand trail England 2-1 in the series. They next take on Bangladesh in a three-match ODI series, which Southee was rested for.
Following their series against Bangladesh, New Zealand will face defending champions England in their opening game at the 50-overs World Cup in India.