Curry limped out of the game in the second half and he will visit a specialist later this week to determine the next course of action.
But Gardner, despite World Rugby's current crackdown on risky play, eventually decided against penalising Farrell's challenge, even though it appeared the England co-captain was leading with his shoulder.
Schonert played for England in their non-cap match against the Barbarians at Twickenham at the end of last season having missed out on the tour of Argentina in the summer of 2017 because of a hand injury.
The clock had ticked past the 80-minute mark at Twickenham with England desperately trying to keep the Springboks at bay when Farrell smashed into replacement Andre Esterhuizen, knocking him back and dislodging the ball.
"He is a fantastic young player and we saw that in the game time he had against South Africa at the weekend".
Eventually, Gardner decided against awarding the Springboks a kickable penalty that allowed England to hold on for a 12-11 victory. Nothing upset me about the tackle, we just have to latch on that if it is legal.
"I just think the game is getting more intense". Well, you're going to do it at some stage - you know that, you know that. You know that. You know that.
Itoje looked fortunate to get away with what appeared to be a high tackle and England hit the front for the first time courtesy of a huge Daly penalty from close to the halfway line.
Jones said the squad is using the knowledge of both the coaching staff and playing set-up to formulate a game plan to beat the world champions on home soil.