De la Porte said she had spent the entire day with Gwala at Inkosi Albert Luthuli Central Hospital, where the triathlete was X-rayed and scheduled for an operation.
"The doctor says the blood flow is good, the only problem is with his tendons," said Gwala's friend and training partner Sandile Shange.
With a promising sporting career, Gwala had already competed in two international triathlons.
Triathlete Henry Schoeman broke the news on Twitter with a Tweet that read: "A friend of mine, cycling in the Durban area was robbed by three people this morning, Then they attempted to saw off both legs with a chainsaw. Blade too blunt and only got half way through one and started on the other. Absolutely disgusting! How safe are we on SA roads?"
Provincial police spokesperson Captain Nqobile Gwala said the attack had not yet been reported and so could not comment further on the incident.