In highlights from the game, Mariners are 2-0 up in the second half of a friendly against Macarthur South West United.
"I was just trying to remind myself to set up and get a good shot, that's all I was telling myself", Bolt told Xinhua after the match. "I'm keen. That's why I'm here, to play my best and to try and get into the team". He later posted video of his goal on Instagram with the caption: "Dreams become Reality through hard work".
"Slight improvement if you want to say that but his touch is still very poor", Bosnich, now a Fox Sports commentator, said during the match.
The 100m and 200m world record holder has previously trained with Borussia Dortmund, South African club Sundowns and Norway's Stromsgodset.
In August, Bolt made his debut for the Mariners, coming off the bench during a 6-1 pre-season rout against amateur outfit Central Coast Select. I think my touch is that little bit better; my vision needs to improve a little bit more.
Rare, polio-like condition appears in US again
During the 2014 national spike in AFM cases, Minnesota had three cases, and since then has averaged about one case per year. Symptoms of AFM are comparable to polio , including numbness of the limbs, facial drooping and slurred speech.
"All I can do is do what I wanted to do, prove myself", he said.
"In the initial dispatches talked about he needed time, I said at the time we will give him 12 months if need be", Mulvey said.
"This will determine... [what] the club want to do with my career, so it's a very important game", Bolt said. "I think my running off the ball is where I've improved most".
His attack came together in the 57th minute when he collected a through ball just outside the 18-yard box, took his defender wide and smacked a left-footed shot past the keeper. "I've just got to continue learning and getting better".
He had made a couple of appearances before Friday's match for the side that finished 10th in the last A-League season.