Watch: Usain Bolt's first goal as professional footballer for Central Coast Mariners

Sprint legend Usain Bolt scored his first professional goal in a pre-season game for Australia's Central Coast Mariners against Macarthur South West United in Sydney.

The eight-time Olympic champion recovered from a painful kick in the groin to net two goals in the same match.

The 23-year-old finished with his left foot after some slack marking on 55 minutes, celebrating with his trademark 'Lightning Bolt' pose.

He then capitalised on a defensive mix-up to score his second on 69 minutes before being substituted six minutes later with the score at 4-0.

It was the first game Bolt has started since joining the A-League club in August for an indefinite trial.

Watch Bolt's stunning goal:

Earlier, he had admitted that he was struggling with the tempo of professional football but is working hard to raise his fitness levels.

His lack of football fitness was evident as he appeared to tire quickly, resting more than his teammates during the training sessions.

"The most challenging thing for me is the stop and go because I'm not used to picking up speed, going back down, then back again," said Bolt.

"It's all about practising and getting used to the system. I have time so will just learn the ways and keep pushing."