"Piri had no history of any migraines before and was fine while we were overseas," Kara said. "It did not happen again but it was an unusual presentation at the time.
"Because of the unusual presentation we arranged for him to have an MRI when we returned home. I've had a quick look at the scan and it looks okay."
Migraine sufferers can struggle with slurred speech but Weepu did not show any of those symptoms. He had felt nauseous and a little light-headed at the time.
"We don't know what might have triggered it. It could be lots of things," Kara added. "It is not related to any head knock that we know of."
With rugby's concussion debate heating up, it seems prudent to err on the side of caution with head issues, even though Weepu's case is not concussion-related.
Weepu played 61 minutes without concern for the Blues on Saturday night at Eden Park against the Cheetahs and will again be needed to share the halfback duties with Bryn Hall against the Highlanders this weekend. The squad's third halfback, Jamison Gibson-Park, is still nursing a stress fracture in his foot. Campbell Burnes