Usain Bolt will give himself up to the end of the month when he decides whether to pursue his career in professional football.
The 8th seed Spencer champion, who played for the Olympics, declined the offer from the Central Coast through a long-term trial against the A-League club.
Despite not signing a contract with the Mariners, Bolt took the A-League latest clash with Melbourne Victory on Sunday.
He caught up with Victory marquee man Keisuke Honda in the rest of the Melbourne team the next day.
Bolt said Omnisport "received many suggestions from many other clubs.
"If I go to another club or actually hang up, I will make a decision by the end of November."
In addition to the time at Mariners, Bolt has trained to become a professional football player with Norwegian team Stromsgodset and German giant Borussia Dortmund.
The 32-year-old has rejected the Maltese club's offer before the end of the Mariners' match.