Chris Woakes was adamant England's surprise World Cup defeat by Pakistan was "no car crash" but accepted they would have to raise their fielding standards after a sloppy display contributed to a 14-run loss at Trent Bridge.
Pakistan compiled a daunting total of 348-8. Even though Joe Root and Jos Buttler made hundreds, England could only reach 334-9 in reply.
Woakes, Jofra Archer and Adil Rashid were all expensive, and they were not helped by a poor fielding effort.
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Jason Roy's extraordinary drop that reprieved Mohammad Hafeez on 14 resulted in him top-scoring for Pakistan with 84.
Woakes, who showed England the way with four catches, was at a loss to explain the decline in England's performance just days after setting supreme fielding standards during their 104-run thrashing of South Africa at the Oval in World Cup opener.
He accepted England would need to raise their fielding against Bangladesh in Cardiff on Saturday.
"By no means was it a car crash but it was the difference in the game," said Woakes. "We didn't field as well as we can and probably left 20 runs out there. It was just one of those days where we fumbled a few, probably dived over a couple.
"We're obviously a very good fielding team, we've proved that over the past few years, and this was just an off day. We proved our standards at the Oval. We'll meet up in Cardiff, go through our routines and try to meet those same standards."
Woakes said the round-robin nature of the 10-team tournament meant it would be tough to win the World Cup without losing a group match.
"It's unlikely any team will go through the tournament unbeaten and if they do it's a hell of an effort," he said. "You're going to have ups and downs form-wise. Sometimes it's about how you bounce back.