Australian wicketkeeper Sam Harper still under observation after being struck with bat

Wicketkeeper Sam Harper remains in hospital four days after suffering concussion, caused by being hit by a bat during a Sheffield Shield match.

Playing for Victoria against South Australia, the 20-year-old was caught on the front of the head by the follow through of batsman Jake Lehmann who was attempting to play a pull shot.

Harper was standing close to the stumps at the time, with Lehmann - son of Australia's national coach Darren - facing a spinner.

According to the hospital, Harper has spent a fourth day being monitored, with the Victoria state team confirming that while their player has not suffered serious injury, he was still exhibiting symptoms of concussion.

Harper had been wearing a helmet at the time of the incident and subsequent scans did not show any internal bleeding or bone damage.