Morne Steyn has been called into South Africa's squad for the second Test against Ireland as a replacement for the injured Pat Lambie.
Fly-half Lambie suffered concussion in Saturday's 26-20 defeat to 14-man Ireland, who earned a historic first win on South African soil in Cape Town.
Subsequently, Lambie must take a mandatory one-week break and was ruled out of the second contest in Johannesburg on Saturday.
Experienced number 10 Steyn - who has 60 caps to his name - comes into the fold in his place and head coach Allister Coetzee says the Stade Francais fly-half was always in his plans.
"I made it clear we would definitely consider Morne as a replacement option because of his vast experience, and I would therefore not hesitate to draft him into the match-day squad," Coetzee said.
"Garth April is still a talented young man and was selected to learn and to develop. It is his first year in Super Rugby and his involvement with the squad will benefit him in the long run.
"Pat will return home for this week and we want to wish him well with his recovery."
Steyn has amassed 694 Test points since making his debut against the British and Irish Lions in June 2009.
The teams will conclude the three-match series in Port Elizabeth on June 25th.