Usain Bolt
Bolt nets first professional goals in football (image courtesy Dan Himbrechts/AAP)

Former Australia coach Ange Postecoglou has questioned Usain Bolt ability to become a professional football player and earning a professional A-League contract at the age of 32.

The Jamaican Olympic champion sprinter is undergoing trials at Central Coast Mariners in Australia’s top-flight and scored two goals in a pre-season match a week ago.

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However, the Jamaican has yet to be offered a contract, and most football pundits in Australia have questioned his ability to break into the league.

Postecoglou, who won back-to-back A-League titles as coach of Brisbane Roar, said “good on” Bolt for trying but the 53-year-old was quick to underline the scale of his task.

“It seems to have got some good attention for Central Coast Mariners, the club there,” Postecoglou, now coaching Japanese club Yokohama, told local media.

“But beyond that I’ve always believed that football is one of those sports that’s very, very difficult to just change from one to the other.

“If you haven’t done it from a very small age and hone your technique and skills, (it’s) very, very difficult at a later age to switch to our sport and play at the highest level.”

Bolt was earlier this week offered a two-year deal by Valletta FC, local champions in the tiny Mediterranean island state of Malta.

But the former world sprint champion turned it down, ESPN reported, citing his manager.