It looks like Kolbe prefers playing sevens next year (because of the Olympics, end of July), so possibly not available for (some of) the Springboks tests.
Cheslin Kolbe has revealed that he is targeting a return to sevens rugby in the 2020 Tokyo Olympic Games after finishing the current French season with Toulouse.
‘I want to be a European champion with Toulouse and we can maybe do it this season,’ Kolbe added. ‘This is my next goal, with the one, I hope, to represent South Africa with the national team at sevens at the Tokyo Olympics in 2020.’ Kolbe last played sevens in the 2016-17 World Series and was part of the Blitzboks team that finished with a bronze medal in the 2016 Rio Olympic Games.
Will be interesting to see how this managed by SA Rugby.
The SA Sevens setup generally shies away from "XV's imports" for these events (although it does happen) because Sevens has become such a specialist game. But Kolbe did spend a long time with them before, so it is not new to him.
But I suspect, they'd like him with the Sevens team pretty exclusive of any other commitments.
If he goes that route, it opens up opportunities elsewhere. S'bu Nkosi would get back to show his skills, which are not unimpressive.