"Match officials had concerns with potential elbow flexation when viewing the bowler's action with the naked eye," the ICC said.
West Indies pace bowler Jermaine Lawson has been reported for a suspect bowling action, the International Cricket Council said on Sunday.
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Lawson, returning to the test side after a back injury, took eight wickets in the first test against Sri Lanka in Colombo which the hosts won by six wickets on Saturday.
"The match officials had concerns with potential elbow flexation when viewing the bowler's action with the naked eye," the ICC said.
"This assessment has led the team of officials to request the ICC to commission a biomechanical report into the bowler's action in accordance with the new process introduced earlier this year."