I'm sure you know much more about it than I do, but from his wikipedia page, seemed like he trained with an Australian club for eight weeks, played in a few friendlies, did not play any pro matches, and then retired.
Here's an article that says he did not play in any matches for the team once the season began. "
He scored two goals in his first effort for the Mariners in a friendly, but did not play matches when the season began." I apologize if I'm missing some context here, but the two sources I've looked at seem to be saying that he never played in any professional matches.
https://www.bbc.com/news/world-australia-46068150 https://en.wikipedia.org/wiki/Usain_Bolt#Football_career