Bolt's trial period with the A-League club came to an end at the weekend and the Mariners now have to decide whether to offer the Jamaican a permanent deal, a further trial period or release him.
While that doesn't narrow things down much, ESPN report that Bolt's current club Central Coast Mariners have player development links with Sheffield United, Ferencvaros in Hungary, Everton and Maltese side Balzan.
Bolt's agent in Australia, Tony Rallis, had also confirmed the approach, ESPN said.
Central Coast Mariners have had long-term links with Bramall Lane as a sister club of United.
It has seemingly put the Mariners on the clock to give him a full-time professional contract despite January being flagged as the probable deadline for a final decision.
Gallop said there was no chance of using the marquee fund to meet Bolt's contract demands as its goal was to attract proven world-class players.
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Signing Bolt has obvious appeal.
Bolt has previously trained with German giants Borussia Dortmund and trialled with Norwegian side Stromsgodset. "How? I'm not even a professional footballer yet".
However, on a story post via his Instagram account, Bolt revealed a demand for an out of competition test - to collect urine and blood - that appeared to have been issued by Football Federation Australia (FFA).
"We have to sit down with the coach and the management and see if we go forward, what's the plan and if they want to sign me or if I need to do more".
"And she said they told her I'm an elite athlete so I have to get tested".
The Mariners have stayed officially tight-lipped, but one senior club source speaking to Australian sports website TheWorldGame described the Bolt exit talk as "totally wrong and without foundation".