Jack Colback admitted Newcastle's performance in a 5-1 defeat at Crystal Palace had been "embarrassing".
Yannick Bolasie and James McArthur both struck twice as the Eagles hammered the hapless Tynesiders 5-1 at Selhurst Park, Newcastle's seventh defeat in 11 league clashes to heap the pressure on Newcastle manager Steve McClaren.
He readily accepted Newcastle's board could easily lose patience with him, while Colback did not hold back in his assessment of the game.
"We had a game plan and in the first 15-20 minutes it worked perfectly. We got the goal and you could see they were rattled," Colback told Newcastle's official club website.
"But we let them straight back in, then I made a mistake for the second goal and that put us on the back foot again. After that it was pretty embarrassing, really.
"Maybe we're not strong enough character-wise. It seems as if as soon as things go bad, it goes really bad.
"We had that last year and probably the year before as well. It's something that's hanging over the team that we need to get rid of.
"We had shown signs of improvement but the Leicester game and this one have really set us back quite a lot."
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Cheick Tiote has shrugged off claims that he was a "bad egg" in the Newcastle dressing room as he attempts to rejuvenate his career on Tyneside.
The 29-year-old Ivory Coast international midfielder is back in the team after finally recovering from a long-standing knee injury and is working hard to rediscover his early form for the Magpies, which at one point saw him linked with both Arsenal and Manchester United.
However, he returned having been accused in some media quarters of being an unsettling influence within the camp, something flatly denied by head coach Steve McClaren.
Tiote told the Chronicle: "It didn't affect me, I know myself that I didn't do anything bad. Everybody at the club and my partner knows that.
"I just do my best for the team, that is the most important thing. All I want is to see the team go forward and win games."
Victor Valdes' difficult spell at Manchester United is set to end in January, according to his agent.
The ex-Barcelona goalkeeper has only made two appearances since joining the Red Devils in January after recovering from knee surgery.
Valdes has had a strained relationship with United manager Louis van Gaal and was not given a squad number for the 2015-16 campaign.
When asked about Valdes' future, his agent Gines Carvajal said to Radio Marca: "He'll have a chance (to play) in January, wherever he goes.
"He needs to go to a place he feels is right for him."
Carvajal does not envision the 33-year-old Spaniard returning to his home country to play.
"He won't be coming to Spain, unless he decides otherwise," he said.
Valdes, a Euro 2012 winner with Spain, becomes a free agent next summer.
He is a reported target of Newcastle United, who are looking to strengthen their backline after losing their first-choice goalkeeper Tim Krul to a serious knee injury at the weekend.
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Striker Papiss Cisse remains committed to Newcastle amid continuing speculation over his future on Tyneside.
The 30-year-old Senegal international, who scored his 35th Barclays Premier League goal for the club in Sunday's 2-2 draw with Southampton, has been linked with Turkish duo Trabzonspor and Fenerbahce, as well as clubs in China and the Middle East, this summer amid the Magpies' ongoing interest in QPR frontman Charlie Austin.
However, he insists he is focused only on scoring goals in a black and white shirt as the transfer window enters its final few weeks.
Cisse told the Chronicle: "I have a contract at Newcastle United. I need to be professional every time I play. I don't have a team to leave to.
"I am a Newcastle player. I try to work hard in every game I get."
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