Former top AFL player agent turned A-League boss Jason Sourasis is fighting a series of business battles that could scupper a rescue deal for his financially embattled club Western United, which has been late paying player wages again.

The Age can reveal that Sourasis has been hit with a near $3 million personal tax bill via a director penalty notice from the ATO for unpaid taxes across six of his businesses, including the companies underpinning the A-League finalists.