Trevor Sinclair believes Manchester City should sell Yaya Toure this summer and bring in some new players.
The former City winger believes Toure, who has been linked with a switch to Inter Milan, has been a shadow of the player that helped the club win the title last season.
Toure was criticised for ducking his head while in the wall when Jason Puncheon scored a free-kick in Monday's night’s 2-1 defeat at Crystal Palace.
Sinclair believes Toure has not been the same player since his agent criticised the club last year for not celebrating the player's birthday.
He told The Morning View: “He’s been a fantastic servant. Just from last year, after his birthday, his agent and came out and said he was disappointed. I don’t think he’s committed to the club anymore.
“He’s a massive fans favourite and has been a fantastic servant but I think now is the time to let him go and experience some other football and bring in some fresh blood in.”
The Ivory Coast midfielder was also criticised by Jamie Carragher for not blocking the free-kick from Puncheon in the first half.
On Sky Sports’ Monday Night Football, the former Liverpool defender said: “That's not acceptable when you go into a wall.
“The rest of them are desperate to be hit with the ball in the face and it's poor from Yaya Toure.
“As he [Puncheon] connects with the ball, if you look at the knees, they're all crouching ready to jump. Yaya Toure doesn't look in the same position as the rest to start with.
“The only thing I was thinking was, 'does he think it is going to hit him in the face?' He puts his head down to try to head it away.
“That's just damning for Yaya Toure.”
The defeat leaves City in fourth, nine points behind leaders Chelsea.
And Sinclair, who played for the blue half of Manchester between 2003 and 2007, feels City’s key players have not performed to their potential.
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“Vincent Kompany will hold his hand up and Samir Nasri, even Pablo Zabaleta, who City fans adore and rightly so, he hasn’t been himself," he said.
“Sergio Aguero hasn’t scored as many goals, nor Edin Dzeko. They sold Alvaro Negredo and haven’t replaced him.
“You look at the average of 29 - they need some young players in.”
The reigning Premier League champions are a point behind third-placed Manchester United ahead of Sunday’s derby which is live on Sky Sports 1 at 4pm.