Ryan Harris has insisted that he is focused on prolonging his international career after inspiring Australia to a series win over South Africa.

The seamer took the final two wickets to hand the tourists a 245-run win in the third Test on a dramatic final day in Cape Town on Wednesday.

Some reports have suggested that ongoing knee problems could cut the 34-year-old's career short, but he claims that he is not finished at the highest level yet.

"I'm bloody going to enjoy a break, I can tell you that," Harris told reporters. "But knowing that, it's going to take a lot of hard work to get up and going again.

"Coming into this series I was a little bit underdone fitness wise, I need a good pre-season to build up some strength.

"I want to keep playing here as long as I can - moments like today, there's nothing better."

Harris will undergo surgery on his knee when he returns to Australia.