Perera seemed to have endured a possible 'brain fade' moment like Australian skipper Steve Smith, who had also looked at the dressing room for hints after his dismissal during the second Test in Bangalore last March.
The incident happened in the last ball of 57th over with Perera yet to open his account when he was struck on the backfoot by an indipper. The ball was clearly in-line and was given out by Llong.
It was, however, not clear whether any assistance came from the dressing room.
The whole incident was caught on TV camera, as commentators began referring to the Steve Smith 'cheatgate' controversy.
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The decision was eventually overturned as the impact was marginally outside the line and Perera survived but strangely there was no protest from Virat Kohli and Co.
During the Bangalore Test in March, Kohli had fought over Smith's decision and it had snowballed into a big controversy.
According the ICC Standard Test Match Playing Conditions for 2016-17, the umpires may decline a review if they believe the fielding captain or batsman has received any outside input.
"The captain may consult with the bowler and other fielders or the two batsmen may consult with each other prior to deciding whether to request a PlayerReview," the Playing Conditions states.
"Under no circumstances is any player permitted to query an umpire about any aspect of a decision before deciding on whether or not to request a Player Review.
"In particular, signals from the dressing room must not be given.
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