The 30-year-old excelled in domestic action for the Pumas in his homeland this season and has a raft of Currie Cup experience behind him but stepping straight into top-flight continental competition would be a baptism of fire.
Head coach Alan Solomons, himself a South African, insists the fly-half is more than capable of proving his worth on the big stage, though, as Edinburgh look to keep their quarter-final hopes alive ahead of the Round 6 match up with Munster.
"We brought Carl into the squad on a trial as well as to serve as injury cover. His availability presents us with selection options for Saturday's match-day squad," said Solomons, who is currently without fellow fly-halves Harry Leonard, Piers Francis and Gregor Hunter.
"Carl has performed really well for the Pumas and played a pivotal role in their Currie Cup success this year. His game management is very good, he's got a good boot out of hand and for goal, and is very athletic.
"He now has an excellent opportunity to show us what he is capable of, while also solving an immediate issue in that we are desperately short of fly-halves. We will have to see how he tracks for us but I think he has the ability.
"He's trained well with team since his arrival, while Greig Tonks has performed admirably since moving from full-back to fly-half so, despite still having injuries in this position, we go into the Perpignan match in relatively good shape in that regard."
Edinburgh currently sit third in the pool with two wins and two defeats to their name, with a surprise success at Gloucester last time out re-igniting their slim hopes of reaching their knockout stages of either the Heineken Cup or the Amlin Challenge Cup.
A Munster victory at Gloucester on Saturday night would extinguish their Heineken Cup dream a week early however they perform at home to Perpignan but an English triumph coupled with a win of their own could see them remain in the hunt ahead of their trip to Thomond Park in Round 6.
Prop forward Nel says qualification isn't their primary focus given that it is out of their hands but he insists they are desperate to finish the pool with a brace of big wins, regardless of how things pan out elsewhere.
"I don't think we have spoken about how we can go forward (qualify)," Nel told The Scotsman. "Munster must lose every game now and we must win every game.
"But, for us as players, every game we have been getting stronger and stronger and to win these two games will mean a lot to us as a group, so it is important to go game by game.
"And this is a big game. All French teams have massive packs and it can take some time to wear them down, but you do that and make them tired so you can get on top of them.
"We can take a lot from that game in Perpignan (in Round 2). We had just started in the Heineken Cup and we have grown since then. We can take (a lot from) that 40-50 minutes at the start and be confident that we can beat those guys. We are much better than we were back then."