Lineker, who played in two World Cups and netted 48 goals during his England career, said he still believes England will beat Slovenia in Wednesday's crunch game and qualify for the knock-out stages of the tournament.
Lineker, 49, said: "It's hard to find anything positive to say about that performance, or anything good to say about any of the players.
"It was like they'd had the talent zapped out of them. They just didn't look like the top class performers we see each week in the Premier League.
"And it's almost impossible to explain what's going wrong. Whether it's the huge pressure of having the expectation of a nation on their shoulders that's getting to them I don't know, but something's not right."
Lineker - who reached the semi-finals of the World Cup with England in 1990 - said Capello's men could turn it around if the manager changed from the rigid 4-4-2 system that has seen England score just one goal in two games and included creative midfielder Joe Cole.
He added: "Things can change very quickly.
"When I played in Mexico in 1986 and Italy in 1990 we started badly and then went on to have good tournaments. That can happen again because we have the players.
"And let's face it, we've got Slovenia to play next and they really aren't a good side. When things started going wrong for them against the USA they started sitting deeper and deeper and that will suit us.
"Knowing they have to win might focus the players minds and if there was one team I would fancy us to beat it would be Slovenia."