Perth Glory's Irish striker Andy Keogh says Usain Bolt will never make it as a professional footballer.

The 31-year-old former sprinter was offered a contract by the Central Coast Mariners last week after trialling through the off-season with the A-League strugglers. The Jamaican was said to have knocked back the offer with it falling well below his asking price.

Damning: Andy Keogh (left) has little time for the Usain Bolt experiment. Credit:AAP

Keogh, who played in the English Premier League during his career before moving to Perth in 2014, told Irish sports show The Keith Andrews Show he didn't think Bolt would ever be good enough to play professional football.

"Because I play in the A-League, it's nice to have the attention on the A-League, but him playing in the A-League, that's not for me," Keogh said.