New Delhi, Oct. 13 -- Australia Vice-Captain Steve Smith will undergo a second test for concussion following a gruesome blow to his head on day four of the first Test against South Africa in Durban on Monday.

Smith sustained the injury while batting during Australia's second innings. He looked to duck a short-length ball from pacer Anrich Nortje.

To Smith's surprise, the ball didn't rise as much as Smith would have anticipated, and as a result, the ball ricocheted off his helmet before it bounced towards fine leg. The former Australia skipper was then assessed for concussion on the field and was given the green light to continue his innings.

The 37-year-old was eventually dismissed for 27 by Simon Harmer as Australia later declared the...