The West Australian Football League is bracing itself for another drug shock, with an Australian Rules player from premiers Swan Districts reportedly returning a positive A-sample.

The test, conducted by the Australian Sports Anti Doping Authority, is believed to have discovered levels of the performance assisting drug Sudafed, which has the potential to raise a player's heart rate and lead to enhanced bodily function.

The player, who can't be named until results of the B-sample are known, was tested by ASADA after Swan Districts' thrilling one-point grand final win over Claremont last month.

Although he has been notified of the positive A-sample, he is not obligated to notify others until the results of the 'B' sample comes through.

Earlier this year, East Perth midfielder Dean Cadwallader was banned for two years after testing positive to anabolic steroid nandrolone

Cadwallader is appealing his suspension.

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