SOCCER’S governing body has stepped up its probe into soccer star Harry Kewell’s deal with Fiat Chrysler as the scandal surrounding the auto giant escalates.

Football Federation Australia has asked Melbourne City for emails and other correspondence about superstar Kewell’s dramatic move from Melbourne Victory to rival club Heart in 2013.

“Football Federation Australia has requested documentation from Melbourne City in relation to its enquiries into the Harry Kewell matter,” said an FFA spokesman.

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FFA, which keeps its own record of player contracts, opened an investigation into the Kewell deal after questions from the Herald Sun in late May.

Details of Kewell’s $1 million-a-year Jeep deal were revealed in a lawsuit between Fiat Chrysler Australia and its former chief executive, Clyde Campbell.

Documents filed with the Federal Court allege Mr Campbell offered Kewell a raft of incentives, including business class airfares, school fees and rental assistance, if he signed with Heart for the 2013-14 season.

There is no suggestion Kewell did anything wrong.

Sports lawyers say deals between players and parties other than their clubs that relate specifically to club contracts risk breaching salary cap rules.

Meanwhile, corporate regulator the Australian Securities and Investments Commission says it is aware of the Federal Court case involving FCA Australia and has not ruled out taking action once the litigation concludes.

The FCA matter is listed for a hearing in the Federal Court on Friday.

FCA has applied to seize the assets of Mr Campbell and wife Simone, including shares, their Brighton home and their holiday homes.

Mr Campbell has denied any wrong doing and has signalled his intention to fight the claim.

carly.crawford@news.com.au