An internal review into irregular practices at Essendon has not recommended the sacking of any key officials at the AFL club.

The report, chaired by former Telstra chief executive Ziggy Switkowski, centred on governance issues at Essendon relating to last year’s controversial supplements program.

Switkowski recommended that any pioneering work with supplements and exotic treatments should be left to the Australian Sports Commission.

“At a club level, this is not an area for risk management but for zero tolerance,” said the report.

“A club’s pharmacology skills should not normally be independently and secretly developed as a source of competitive advantage.

“And an arms race for the most sophisticated molecules must be prohibited.”