A football club has apologised to its fans after a stadium bar was decorated in the colours of its arch-rivals, days before the teams meet in the FA Cup. Bosses at Sunderland AFC have admitted the club made a "serious error in judgement" after banners saying "Keep the Black and White Flying High" and "We are United" were hung at the Stadium of Light, ahead of Saturday's third-round tie against Newcastle. A message reading "Ha'way the lads" in Sunderland red was replaced with the Geordie spelling "Howay" in black. Sunderland play in red and white; Newcastle in black and white. In a statement on its website, the Championship club said sorry to fans for "the understandable concern they have fairly voiced" and said an "immediate review" had been ordered. It also said the Black Cats Bar, which will serve as a corporate hospitality area for visiting fans, would be returned to its previous state before the lunchtime kick-off. The Newcastle United Supporters' Club posted pictures of the Magpies branding on X, joking they "can't fault the hospitality of our hosts this weekend".