Bolt addressed the media after putting himself through a light training session on the first day of his trial with the Mariners and said part of his reason to join the A-League club was due to the European offers not being in the top division.

"We got offers from teams in Spain, France and stuff like that. But for me it would be harder, I'd have to learn a new language. It wasn't in the top division," Bolt said.

"Australia is somewhere I enjoy coming, if you guys know and follow my career, I've come to Australia a lot. For me, the Mariners decided to give me an opportunity and I'm very grateful of that and I'm just here to make them proud, make myself proud and do my best."

Bolt, who also celebrated his 32nd birthday today, has already trained with Germany's Borussia Dortmund, South Africa's Mamelodi Sundowns and Norway's Stromsgodset without signing a long-term contract.

Bolt's "indefinite" training period with the Mariners kicked off on Tuesday morning at Central Coast Stadium.

A 15-minute passing drill, which Bolt completed without any terrible gaffes, was Mulvey's only chance to judge the Jamaican sprint superstar's football skill.

.@usainbolt has landed! ⚡



The next step of his football journey is underway. Don't think limits. #CCMFC pic.twitter.com/YbGYG5rJmv — Central Coast Mariners (@CCMariners) August 17, 2018

Bolt and Mulvey then addressed the assembled media, made up of almost 100 journalists, photographers and camera operators, for over 20 minutes.

"I'm entirely out of my comfort zone but that's why I am here," Bolt said.

"It's just like track and field. The first day of training is always the roughest one. You can tell how much work you need to put in.

"But it felt OK. I know it's going to take time to work and I'm ready to work."

Bolt claimed he isn't setting himself any targets, and that his greatest strength on the park - apart from record pace - is that he is cool under pressure.

"I'm just going to put in the work," he said. I have to get fit."

"I'm just here to push myself ... Iearn and get better. As I told the coach from the start, I'm here with a blank slate."

Bolt noted he would accept and respect Mulvey's judgement on whether the Mariners should offer the 100 metre world record holder a contract, and that he was ready to play any position.

Mulvey continues to insist there is no timeline for the potential recruit, who could be unleashed for the first time in an August 31 trial game, to prove his worth.

"We don't have to make a decision tomorrow or the next day ... I'm happy for him to be here," he said, rubbishing the idea that Bolt could be a distraction.

"The guy is a winner. Eight gold medals in the Olympics, you don't just do that by having great ability."

Bolt, who will be eased into football duties, had a predictably brief opening hit-out in his first training session with the side.

He was all smiles as he celebrated his 32nd birthday, regularly mopping his brow in sunny and windy conditions in Gosford.

The bulk of the squad took part in a simulated match drill while Bolt did some planks and other exercises under the watchful eye of Andrew Young, the Mariners' head of performance.

Bolt's presence has already resulted in unprecedented worldwide media coverage for the A-League.