Alan Hansen feels Arsenal defender Sol Campbell's England career may be over.
Campbell was at fault for two goals as Arsenal lost to West Ham on Wednesday and he left Highbury at half-time.
Hansen told BBC Sport: "Nine-tenths of Sol's game is his recovery pace. If that pace has gone, then there is no way he is an England centre-back.
"He can't go to the World Cup playing like he is at the moment, it is an impossibility. Unless Sol gets himself fit, there is no point in playing him."
Arsenal boss Arsene Wenger revealed after his side's 3-2 defeat that Campbell had been substituted at the interval - and that the 31-year-old then left the ground.
Wenger has stated he is concerned about Campbell's "mental shape" and claimed the player was wracked with guilt about his poor performance.
Hansen believes the problem is Campbell's lack of fitness and he is doubtful the man who was once of the first names on England's team-sheet can regain his sharpness.
"Campbell has been struggling for the last four or five weeks. He does not look fit," said Hansen.
"I don't know what the injury is but even in Arsenal's FA Cup defeat by Bolton the other night, when Campbell was jumping the spring wasn't there. He couldn't get off the deck.
"Campbell's performance against West Ham was a horror show.
"But to be fair, anyone can make a mistake like his mis-kick for West Ham's first goal, and it was a great finish by Nigel Reo-Coker.
"But that led to what happened for the second goal where Sol didn't deal with a long ball over the top.
"He got a touch on it but it wasn't not enough. It was a terrific finish by Bobby Zamora but Sol was on the deck when the ball hit the back of the net.
"When you struggle for fitness, you play badly. When you play badly, you struggle for confidence. When you struggle for confidence, you make mistakes.
"Over the last four or five weeks, Campbell has been making individual mistakes."