Dubai - New Zealand captain Daniel Vettori will undergo a CT scan after being hit on the helmet during the second one-day international against Pakistan, a team official said.
The 30-year-old was ruled out of the first Twenty20 game here on Thursday after the incident brought on vomiting.
"Vettori was hit on the grill of the helmet and has progressively not felt well in the last few days. He vomited on Thursday afternoon, so on doctor's advice we have sent him for a CT scan," said New Zealand manager Dave Currie.
The injury-hit New Zealanders had just 12 players to choose from before the first of the two Twenty20 internationals.
Vettori, who also had a problem with his shoulder, missed out, leaving only eleven fit players.
Pacemen Kyle Mills (shoulder) and James Franklin (back) were also ruled out of the match, while all-rounder Jacob Oram left for home to attend his child's birth.
The scenario forced the Black Caps to call up two local players to act as possible substitutes.
But Currie hoped Franklin will be fit to play in the second Twenty20 match on Friday.
After the Twenty20 series, both New Zealand and Pakistan will play a three-Test series in New Zealand, starting with the first Test at Dunedin from November 25.