South Africa left-arm spinner Aaron Phangiso will miss the first two matches of the Twenty20 series against Australia after tests showed his bowling action was illegal.
An International Cricket Council (ICC) movement expert found his arm extended beyond the 15 degrees allowed.
Phangiso, 32, is in the Proteas squad for this month's World T20 in India.
If he passes a re-test on 7 March, he will be available for the final T20 against Australia and the World T20.
South Africa meet England in their opening game on 18 March.
Phangiso was reported by umpires after helping Lions reach the final of South Africa's domestic 50-over competition.
He will remain with the South Africa squad and work with spin bowling coach Claude Henderson and Cricket South Africa high performance manager Vinnie Barnes to try to remedy his action.
South Africa face Australia in Durban on Friday, Johannesburg on Sunday and Cape Town on 9 March.