Recently, former Premier League referee Clattenberg accused Isaac of his behavior in the "Wrestle" podcast, saying that he should formally submit a transfer request instead of complaining on social media.

Clattenberg said it was time for the club to get rid of the star striker. Fans' attitude towards the Swedes significantly worsened after the weekend's match against Aston Villa.

Before Monday's FA Awards ceremony, Isaac posted a statement on Instagram, accusing Newcastle of breaking some of his promises. The club then issued a statement denied Isaac's claim about a gentleman agreement to allow him to leave this summer. It has been nearly a month since Isaac refused to play in Newcastle's pre-playoffs, and the deadlock appears to be showing no signs of resolution.

Clattenberg told the host: "It's time to let him go. When I saw the fans' reactions when I saw Aston Villa's game, I think it's a turning point. If a player doesn't want to play for the team, it's time to let him go. Enough is enough. Isaac signed the contract, and he was very satisfied with the contract at the time. If he was really angry, why didn't he submit a transfer application? Why didn't he have the courage to do this, just like the previous players?" After the game ended on Saturday, Newcastle fans interrupted Gordon's post-match interview and sang anti-Isaac slogans. Away fans shouted: "We don't care about Isaac, we care about Newcastle United."

Klattenberg believes Newcastle should take a tougher disciplinary action against Isaac's refusal to perform its contract: "Why haven't they fined Isaac a two-week salary? Liverpool created this situation: we could have signed Ekitic so that they could get what they want. They want two, and we want them both. If we signed Ekitic, that wouldn't have happened."

The Post football editor Ian Lederman pointed out that many players who are now regarded as club signs have taken similar actions to force transfers to competitors. Kratenberg retorted that players like Gerald and Rooney never refused to play for their club.

"Fans can change their positions, but this time they have crossed the line. Gerald or Rooney has never refused to play for the team, and Isaac has refused."