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Cardiff Blues have demanded the Ospreys make significant changes to an advert featuring Wales star Gareth Anscombe that has appeared outside the Arms Park.

WalesOnline understands the Blues have complained to the media company in charge of posting ads on their new giant digital screen outside the famous stadium after discovering it this week.

The advert for the derby match at the Liberty Stadium later this month shows Anscombe, who left the Blues for the Ospreys during the summer, and the words "Ospreylian and proud".

Anscombe, of course, is currently injured and will not feature in the match, but the Ospreys are keen to use him to promote the fixture and have paid for the ad to appear outside their rivals' home on Westgate Street.

However, the Blues have taken exception to an image of a recent former player being used on their own board and have asked for changes to be made.

It's also believed they are unhappy with the fact the promotion, sold through RouteMedia , does not use the team's full name of 'Cardiff Blues'.

It's understood Anscombe was happy for his image to be used on the advert, and the Ospreys don't believe they have done anything wrong. Discussions are thought to be ongoing over what happens next.

The screen features a number of revolving digital adverts on a daily basis, including another ad promoting the Ospreys' online club shop.

"Gareth is an Ospreys player, not a Blue anymore,” said Adam Palfrey, Head of Commercial at the Ospreys.

"The Ospreys paid for the board outside the Arms Park to invite the Blues faithful to come and watch the Ospreys at the Liberty Stadium.

"It’s a Welsh derby and the Ospreys feel we have an obligation and duty to promote regional rugby.

"The game against Blues is something we want to promote and encourage supporters to get behind.

"There is nothing disrespectful in the tone of the advert we have used. Gareth is now an Osprey and we are happy he is.

"We are using Gareth to promote the game in Swansea and we have used the same poster in and around Swansea and the Ospreys region."

A Cardiff Blues spokesman said: "We're pleased the Ospreys have spent money with Cardiff Blues and are happy to help promote our upcoming fixture.

"We felt on this occasion it was slightly disrespectful to our supporters.

"For all enquiries about advertising on our digital screen, please get in touch with the guys at RouteMedia."

The derby match kicks off at 7.35pm at the Liberty Stadium on Saturday, December 21.