"The ICC after conducting a study with the help of biomechanics noticed there was certain amount of flexion in most (bowlers') actions when seen in slow motion.
"So they felt some degrees of flexion should be allowed. There are certain numbers for spinners and quick bowlers.
The ICC said the biomechanics' report has clearly mentioned that Muralitharan straightened his arm beyond the permissible degree of five for a slow bowler while delivering the 'doosra'.
However, the degrees of flexion has so far not been incorporated in the Laws of the Game.
Law 24 of ICC rules defines a fair delivery, in respect of the arm, "If once the bowler's arm has reached the level of the shoulder in the delivery swing, the elbow joint is not straightened partially or completely from that point until the ball has left the hand".
Gavaskar also clarified that the on-field umpires were still empowered to 'no-ball' a bowler "if they felt 100 per cent sure that his action was illegal".
"But when he is not cent per cent sure, he -- and even the Match Referee -- can call for video evidence."
The illegal bowling action will top the agenda for the Cricket Committee when it meets in Dubai on Saturday.