Amit's action was reported by on-field umpires Daryl Harper and K Hariharan during Royals' match against Chennai Super Kings at Kimberley last weekend.

"Amit Singh's biomechanical testing report showed that all four types of deliveries tested, u2014 his stock delivery, the off-break slower delivery, off-cutter and leg-cutter u2014 were legal and within ICC's legal tolerance limits," an IPL statement said.

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"The report was provided by Prof Tim Noakes (Human Movement Expert), Dr Kerith Aginsky (Cricket Bowling Specialist/Biokineticist) and Dr Michele van Rooyen (Video Analysis Specialist) from the Department of Human Biology in the Faculty of Health Sciences at the University of Cape Town.

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