Munster Rugby have released a statement saying they do "not condone" the actions of the spectator who entered the pitch to confront Billy Vunipola after yesterday's Champions Cup semi-final defeat to Saracens.
They added that the individual in question does not hold a Munster season ticket and is not a member of the official supporters' club.
Vunipola had been at the centre of controversy during the week after he "liked" and defended an Instagram post by Israel Folau in which the Australian full back made homophobic remarks.
The number eight, who was awarded the Man of the Match award, was booed throughout the match by Munster supporters and was confronted by a spectator at the end of the match.
The EPCR issued a statement yesterday, saying they the authorities had detained the fan and Munster have followed suit with their statement this afternoon.
"Aligned with EPCR, Munster do not condone the entry of any spectator to the field of play.
"The incident following the Champions Cup semi-final at the Ricoh Arena on Saturday involved a spectator wearing a Munster jersey.
"The province wishes to confirm that the identified spectator is not a member of the Munster Rugby Supporters Club and does not hold a season ticket with the province.
"Munster Rugby will investigate the incident further."