Lotto players claimed they spotted a fix in Saturday night's £4.5million TV draw after a ball appeared to have two different numbers on it.
Stunned viewers were perplexed when they thought the say the red number 38 ball also having a number 33 printed on it.
When the ball was revealed during Ireland's Lotto Plus 1 draw on Saturday evening, viewers were quick to spot it and questioned whether it was a "fix", the MailOnline reported.
But organisers today dismissed the claims and simply said it was an "illusion" caused by a "brief reflection of light".
Live footage on RTE showed the ball roll into its slot after being drawn as the second number.