SYDNEY has been fined $20,000, with half of it suspended, for failing to disclose cortisone injections taken by Luke Parker and Lance Frankin during last year's finals series.

Parker and Franklin were both fined $5000 for not completing the required paperwork under the AFL's treatment rules.

According to the League, the Swans failed to keep and maintain a complete, accurate and up-to-date Register of Controlled Treatments in the AFL's Controlled Treatments Register.

The breach does not concern any WADA rules and all treatments used by the players were WADA approved.

In both cases, Franklin and Parker received anti-inflammatory treatment cortisone, a WADA-compliant treatment, but inadvertently failed to declare this as required by the rules.

"In this case, the AFL notes that the club doctor maintained his own thorough medical records of treatments legitimately provided to players," the AFL said in a statement.

"However, clubs must also maintain such records on the Controlled Treatments Register database to enable the AFL to proactively monitor industry trends and target test players as required.

"The AFL took into account that the club’s failure in this case was an oversight during an intense pre-and-post Grand Final period, and that the club otherwise had excellent medical procedures."

The AFL Treatment Rules were introduced in 2013 to go above and beyond the WADA Code and ensure the League can effectively monitor football related supplements and medications provided to AFL players.

Parker went into last year's Grand Final against the Western Bulldogs under an injury cloud after injuring the posterior cruciate ligament in his knee in the preliminary final against Geelong.

Franklin hurt his right ankle in the opening term of the premiership decider and was off the ground for five minutes receiving treatment.

The superstar forward, who was also battling a shoulder problem, returned to the field but was clearly limited throughout the majority of the match.