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Television viewers of Cardiff Blues v Dragons on Friday night got more than they bargained for after Martyn Williams accidentally swore on air.

The former Wales international was working for Premier Sports on their coverage of the festive Welsh derby when he let slip with a bit of foul language after seemingly being told that his punditry wasn't going being broadcast at that moment.

Not realising his microphone was still on, Williams uttered "For f**ks sake". You can watch the clip below.

Warning: Strong language

In the middle of answering a question from presenter Ross Harries, it became apparent that producers were cutting to Sean Holley to interview one of the Dragons players during their warm-up - with Harries appearing to apologise to Williams for cutting him off.

However, Williams' microphone was still on and picked up his reaction.

One fan described it on social media as Williams channeling his "inner Alan Partridge", while another jokingly questioned whether Premier Sports meant to broadcast it.