Witbooi, who is the son of former Mamelodi Sundowns midfielder Surprise Ralani, is regarded as a future prospect in South African football.
If signed by Chelsea, the former Kaizer Chiefs academy trialist would be pushing for first-team football and illuminate the Premier League the way the likes of Benni McCarthy, Lucas Radebe, Steven Pienaar and Shaun Bartlett did.
A move to Europe would also help Amajimbos have a highly-regarded player at the 2025 Fifa Under-17 World Cup finals in Qatar in November if he manages to go to the global tournament.