Cooper had been set to make his Games debut in four events — the 50m and 100m backstroke, 50m butterfly and 50m freestyle.
Cooper made his Olympic debut in Tokyo last year, finishing 12th in the 100m backstroke, and winning a bronze medal as part of the mixed 4x100m medley relay.
Last month at the FINA World Championships in Budapest, the Bundaberg native won a silver medal as part of the Australian mixed medley relay team, and made the final of the 50m backstroke, finishing eighth."Cooper has been sent home from the Dolphins training camp following some wellbeing challenges, including the use of medication," SA said in a statement.
"He has acknowledged his mistakes and accepted the consequences, and Swimming Australia will continue to support him as he addresses these challenges.
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