South Africa all-rounder Ryan McLaren has been ruled out of the second Test against Australia in Port Elizabeth due to concussion.
He was struck on the head by Mitchell Johnson during the opening Test at Centurion Park, where South Africa lost by 281 runs.
He was diagnosed with a mild concussion and therefore ruled out of taking his place in the team for the second game, which begins on Thursday 20th February.
"Ryan was admitted to a Johannesburg Clinic on Sunday evening suffering from suspected concussion-related symptoms including worsening headaches and nausea, which started approximately 30 hours after the blow to his head," team manager Dr. Mohammed Moosajee said.
South Africa Test squad: Graeme Smith (captain), Hashim Amla, AB de Villiers, JP Duminy, Faf du Plessis, Dean Elgar, Rory Kleinveldt, Morne Morkel, Wayne Parnell, Alviro Petersen, Robin Peterson, Vernon Philander, Dale Steyn, Thami Tsolekile
"His condition improved overnight and he was re-assessed by a neurologist as well as a leading sports physician with a special interest in concussion, Dr Jon Patricios.
"He is doing much better and has been discharged but from a medical protocol point of view, any form of concussion is concerning enough to rule him out of the next Test match.
"He will be monitored over the next four to five days and will have further assessment done next week Monday to decide whether or not he can join up with the squad prior to the third Test in Cape Town "
It forces South Africa into making at least one change to their line-up following a humbling defeat but the selectors have not called up a replacement for McLaren.
They will name their team from those remaining in what is now a 14-man squad.
McLaren, who has now played two Tests for the Proteas, had been recalled to the squad for the series with Australia following the retirement of Jacques Kallis.
© Cricket World 2014