Newport Gwent Dragons have claimed Ulster fans racially abused their players during Friday's match in Belfast.
The Welsh side's players raised the issue at half-time during their 14-7 Magners League defeat and the club are to write to the Northern Ireland outfit to highlight their 'concerns and disappointment' at the crowd's behaviour.
Dragons' wing Aled Brew was moved to complain to a touch judge at the treatment meted out by a minority of the Ravenhill spectators.
And a statement released by the club said: 'Following a strong performance against Ulster the game was somewhat soured when the Newport Gwent Dragons team were singled out for racial abuse by a minority of the Ravenhill crowd.
'The issue having been raised by the players at half-time was then taken up by the Dragons' management and brought to the attention of the Ulster officials.
'The Dragons will confirm in writing to Ulster their concerns and disappointment over the incident.'
