Brendon McCullum says England have not become a bad team overnight after they were thrashed by South Africa in the first Test at Lord's.
England had started a new era under head coach McCullum and captain Ben Stokes by whitewashing New Zealand 3-0 and beating India in a rearranged match at Edgbaston to draw the series.
They were brought crashing back down to earth six weeks after that win over India, as the tourists hammered them by an innings and 12 runs to take a 1-0 lead in the three-match series.
England were thrashed inside three days, failing to live with a potent Proteas pace attack in a one-side match that saw them fold to 165 all out in the first innings and only 149 in the second.
McCullum says they must take the chastening defeat on the chin and hit back at Old Trafford next week.
"South Africa deserved the victory. We have a little bit of work to do, but you don't go from being a good team to a bad one overnight." the former New Zealand skipper told Sky Sports.
McCullum felt if anything England were too "timid' rather than overly aggressive.
He said: "It was the type of wicket that the boys reflected that you get in, then you got a cracking delivery from nowhere. I thought our approach was alright
"I think over the last four wins we've had there have been times where we have been behind then able to absorb it and turn it back on the opposition. We couldn't do that today.
"As we said at the outset, you have to buckle up for the ride. We'll come back stronger."
McCullum added: "The wicket was challenging at times and some of the balls were too good for us. If anything I thought some of the dismissals were a bit timid today. We won't overreact after this."
Alex Lees and Stuart Broad top scored with 35 apiece. The hostile pace quartet of Anrich Nortje (3-47), Kagiso Rabada (2-27), Marco Jansen (2-13) and Lungi Ngidi (1-15) tore through England after spinner Keshav Maharaj took 2-35 on Friday.