De Villiers was responding to earlier reports that he had made himself available for selection just 24 hours before the Proteas squad for the tournament was announced.
The incident occurred on Thursday afternoon after the boy apparently suffered a neck injury.
In a batting lineup containing Jos Buttler and Joe Root, with Eoin Morgan and Ben Stokes lower down, Roy was simply the biffer at the top who did little more than give the ball a good wallop.
Defending Tour de France champion Geraint Thomas defied his doubters Thursday as Belgian Dylan Teuns won stage six and his breakaway partner Giulio Ciccone snatched the yellow jersey by just a few seconds on an iconic mountain stage.
Springbok coach Rassie Erasmus denied that he was considering fielding a 'B' team against Australia at Ellis Park in the opening round.
Madagascar coach Nicolas Dupuis, whose contract was set to expire at the end of the competition, admitted Tunisia were simply too strong.
Lions team include two debutants with stalwart Ross Cronje leading a talented young side.
Jean-Luc Du Plessis will form a half back partnership with Justin Phillips, with Dan Kriel and Ruhan Nel in midfield alongside him.
The 37-year-old American, seeded 11, eased past over-matched Barbora Strycova of the Czech Republic 6-1, 6-2 in the semi-finals.
That gave the left-arm quick his 27th wicket of the 2019 tournament, breaking the record of 26 for a single edition he had previously shared with retired Australia paceman Glenn McGrath.
