Joe Mennie has returned to hospital after scans revealed he suffered minor bleeding on the brain and a fractured skull after being struck in the head at training with BBL side the Sydney Sixers.
Fast bowler Mennie was initially thought to have escaped serious injury after being felled on Monday night at the Gabba.
He was taken to hospital in Brisbane for observation and discharged.But the 28-year-old has returned to hospital as a precaution, Cricket Australia chief medical officer John Orchard said.
"Joe was reviewed by a Cricket Australia doctor on Tuesday and had some scans performed that revealed a small fracture and associated minor brain bleed," Orchard said in a statement on Wednesday.
"Whilst this is a serious injury, Joe is feeling well.