Munster and Ireland scrum-half Conor Murray will not receive any further punishment after striking Glasgow's Niko Matawalu.
The incident occured during Munster's win over Glasgow on Friday.
Murray appeared before an independent RaboDirect PRO12 Disciplinary Committee in Cardiff having been cited by the independent Citing Commissioner for an alleged incident of foul play (striking an opponent, contrary to Law 10.4 (a)).
The Committee, chaired by Roger Morris (Wales) alongside Rhian Williams (Wales) and Marco Cordelli (Italy), upheld the citing in that an act of foul play had been committed but found that the act did not merit classification as a red card offence and imposed no sanction. Conor Murray is free to resume playing immediately.
Law 10.4 (a) A player must not strike an opponent with the fist or arm, including the elbow, shoulder, head or knees (s).