The 32-year-old, who has been included in the Proteas squad for the ICC World Twenty20, has been reported after helping his domestic side Highveld Lions into the final of South Africa's provincial 50-over competition on Wednesday when he took 2-38 in eight overs.
"Aaron Phangiso of the bizhub Highveld Lions has been reported for a suspected illegal bowling action during the Momentum One-Day Cup match against the Warriors at Bidvest Wanderers, Johannesburg, on 24 February 2016," the Cricket South Africa said in a statement.
Reports said that Phangiso, who has played 16 ODIs and nine T20Is, is expected to be tested tomorrow at the ICC-accredited High Performance Academy at the University of Pretoria.
Fourteen days after that test, an ICC appointed specialist will furnish the body with written report which will determine whether Phangiso's action is legal or not, according to a report.
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Changes to squads are allowed until March 8, which may see South Africa's selectors look for another back-up spinner to Imran Tahir.
It is the latest setback for Phangiso, who early this year was prevented from boarding an international flight following South Africa's ODI series win in India because he was drunk and disorderly and CSA had subsequently handed him an unknown sanction.