The Lions player accused of spitting at Munster's Diarmuid Barron during their BKT United Rugby Championship clash last Saturday will face no further action.
Munster won the game at Thomond Park 24-17 to secure a spot in the play-offs and guarantee a place in next season's Champions Cup.
The alleged incident happened just after the hour mark, with Barron raising a complaint to the officials.
The TMO was unable to verify it. Following a lengthy delay, play resumed.
After the match, Munster head coach Clayton McMillan said: "We only have three or four angles available to us. I'm sure others might have a look at it but that’s not our job to do now.
"Other people will have a look and if there’s something there to see, then they’ll deal with it, and if there isn’t, then we’ll move forward."
Citing commissoner Eugene Ryan, who has over 15 years' experience in the role, ruled that the video footage of the alleged incident was inconclusive.
A URC statement read: "The allegation of spitting that occurred in the Munster versus Fidelity SecureDrive Lions on Saturday, May 16 was reviewed the Citing Commissioner, Eugene Ryan (IRFU).
"Having examined all available camera angles, the video footage was inconclusive and there was no clear and obvious unsportsmanlike conduct by Lions No 6.
"In particular: 'The audio statement by No 16 of Munster is clear and he states that No 6 of Lions spat into his mouth but the audio statement from No 6 Lions contradicts this and he states that he had trouble with his gum shield after the upright contact before the ruck. He categorically denied the accusation of spitting'.
"As such no citing is feasible in this case."
