The Scarlets have promised to launch an investigation into alleged racist comments and chants from a small group of fans during their epic Champions Cup quarter-final win over La Rochelle on Friday.

In the wake of the region's 29-17 victory over the French heavyweights at the Parc y Scarlets, fans took to social media to voice concerns over 'monkey noises' and 'racist words' used during the famous win over last season's Top 14 table-toppers.

Taylor Richards posted on the Scarlets twitter account: "Heard some people making monkey noises. Couldn't believe it. Absolutely embarrassing."

And Welsh Dragon added: "Lots of very offensive racists words as well."

The official Scarlets twitter account replied: "We are absolutely devastated to hear this. Please rest assured that this will be invetsigated."

The allegations threaten to take some of the gloss off a famous day for Scarlets rugby that took them into the semi-final of the Champions Cup for the first time since they crashed out to Leicester in 2007.

The scenes on the pitch after the full-time whistle were joyous with the players revelling in the special atmosphere created by the sell-out Parc y Scarlets crowd.

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It's believed a small group of fans were questioned by stewards over racist chants throughout the game.

And now it seems the Scarlets are poised to their own probe.

The Scarlets have been asked by WalesOnline to comment further on the matter.