Joe Root urged England to keep calm and carry on after a surprise 14-run defeat by Pakistan at Trent Bridge on Monday checked their progress at the World Cup.

Read: 'Mercurial' Pakistan show their other side, upset World Cup favourites England

Both Root and Jos Buttler scored hundreds but Pakistan still managed to end a run of 11 straight losses in completed One-Day Internationals — including a 4-0 series defeat by England — with a well-deserved win.

But with all 10 teams playing each other in the round-robin group stage, one defeat is by no means the end of England's latest bid to win the men's World Cup for the first time.

Root now expects England, the world's top-ranked ODI side, to bounce back strongly against Bangladesh in Cardiff on Saturday.

"The most important thing now for us as a group is not to panic," he told reporters.

'Don't make mistakes twice'

"We know what works for us as a formula, and as a team, but other sides are allowed to play well and we've got to make sure we learn quickly and bounce back at Cardiff.

"The temptation is to get a little bit tense, but one of our great strengths as a side is sticking to the way we go about things and be as smart as possible.

"And the beauty of this format is I do believe the best four teams over the tournament will qualify for the semi-finals and we've got to make sure we play some good cricket in our remaining games."

The Test captain insisted: "One thing this side doesn't do very often is to make the same mistake twice and I'm sure the guys will make sure it's a very different performance against Bangladesh."

Pakistan's 348 for eight — in marked contrast to a total of 105 all against the West Indies in their tournament opener — left England needing a new record for the highest successful World Cup run-chase if they were to win on Monday.

They lost early wickets, however, on the way to 118 for four before Root (107) and Buttler (103) gave them hope with a partnership of 130.

England, however, were ultimately made to pay for an unusually sloppy display in the field.

Mohammad Hafeez was dropped by Jason Roy on 14 — a sitter of a chance at mid-off — before top-scoring for Pakistan with 84 while England gave away runs with several overthrows and mis-fields.

It was all so different from England's fine fielding effort during a 104-run thrashing of South Africa in last week's first match of this World Cup.

"It was just a really bad day in the field," said England captain Eoin Morgan.

"There were mistakes that we don't normally make. And that's disappointing.

"We've gone from probably one of our best performances in the field at the Oval to, not extremely bad, but it's cost us probably 15-20 runs in the field which is a lot in the one-day game."

The umpires warned both Morgan and Pakistan counterpart Sarfaraz Ahmed about deliberately throwing the ball in on the bounce — a tactic that is used to scuff the ball up in a bid to generate reverse swing.

Buttler also appeared to look long and hard at the ball after his dismissal.

"There were discussions throughout the whole of the two innings," said Morgan.

"The umpires came to me mid-innings and seemed to think that we were throwing the ball in on the bounce too much or it was being over-exaggerated.

"They emphasised it would be the same for both (teams).

"The conversations that were stopping the game were that Pakistan were doing the same thing," he explained.

The Dubliner added: "Jos was just intrigued to see the ball. When the ball is hit against the LED boards (on the boundary) it does scuff it up quite a lot, so he was just interested to see if the ball was more scuffed up."