Bulls centre Jan Serfontein has withdrawn from South Africa's U20 squad for the upcoming Junior World Championship in France.
SARU has confirmed that Serfontein will be replaced by Rohan Janse van Rensburg, a team-mate of Serfontein's at the Blue Bulls.
Serfontein, the IRB Junior Player of the Year in 2012 and standout player of last year's Junior World Championship tournament, is currently a member of the Springbok training group, which have just completed a training camp in Durban.
Janse van Rensburg represented the SA Schools last year and also attended the SA U20's previous training camp two weeks ago, as a reserve player.
The Junior Springboks travel on Thursday to France where they will defend their Junior World Championship title. The tournament will be held from 5 to 23 June across three venues in France.
Meanwhile, the Junior Springboks wrapped up their on-field preparations with two training sessions on Tuesday in Stellenboch.
The morning field session was followed by a contact session in the afternoon against the SARU President's XV, who will be in action on Saturday in Stellenbosch against Namibia.