Dozens of casual labourers left the Hambantota international cricket stadium on Monday night in their underwear after they were forced to hand back the uniforms they had been provided.
"The way they were treated is unacceptable and I have ordered that they be given a new set of clothes plus an extra day's wages," board chief Thilanga Sumathipala said. "It is inhuman and slavery."
Soon after the news broke on Tuesday, the board had issued a formal apology.
Sumathipala said an investigation was under way and those responsible would be dealt with.
Zimbabwe claimed the one-day international series against Sri Lanka 3-2, embarrassing a home side that has struggled with fitness, losses and coaching upheaval.
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