Thomas Tuchel has said England "were the biggest danger to ourselves" against Spain due to individual mistakes but insisted he is not worried about the team's defensive record.
The Three Lions are in Prague ahead of Tuesday's Nations League clash with Czechia, aiming to bounce back from Saturday 3-2 home defeat to the world champions at Wembley.
Both Marc Guéhi and Nico O'Reilly made errors leading to goals as Spain extended their unbeaten run to 39 matches.
England have kept just four clean sheets in their last 13 games. They were the joint-top scorers at this summer's World Cup along with France -- the pair played out a chaotic third-place game in Miami which England won 6-4 -- but also conceded the most (12) alongside Iraq and Tunisia. Winners Spain, by contrast, let in just one goal during the entire tournament.
Asked if England's defending was a cause for concern, Tuchel said on Monday: "Not yet, not yet but the last two matches were 6-4 against France and 2-3 against Spain. That in itself is seven goals in two matches, very unusual. It is not a concern yet.
"I felt in terms of organised defending, block defending and active defending to not spending too much time in a low block, pushing out into a middle block pushing out into a high press was on a very good level, a higher level than many other matches.
"With a pure set up of defending, isolated, if you want to look at it isolated within the structure an the units of the sides, I was quite happy and I think this was a step ahead. We suffered clearly from individual mistakes when we had the ball, especially in the deep build-up.
"Of course, that is something we cannot repeat, especially not at this kind of level. We have to take care about this. We have to be technically absolutely clinical also under pressure. We need to improve these things but strangely enough, when we had the ball we were the biggest danger to ourselves around the box because we just had too many individual mistakes.
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"Purely in defending, I have no concerns and trust that we can do it."
O'Reilly and Ezri Konsa did not train with the rest of the squad prior to their flight from London and Tuchel suggested both have "minor issues" which will be assessed on Tuesday morning with the England boss reluctant to rotate too much despite the quick turnaround in games.
Defeat against Czechia -- where they lost 2-1 on their last visit under Gareth Southgate in 2019 - would leave England with an uphill battle to reach the Nations League quarter-finals in June but Tuchel rejected the notion Tuesday's game was a 'must-win.'
"It's a bit early for a 'must win', a bit early in the group for a 'must win'," he said. "We always arrive at every match preparing the team with a target to win. It's always the target, it was the target against Spain, it will be the target tomorrow.
"We respect the opposition, respect their quality, respect the challenge it brings. If you play in Prague against Czechia, it will be difficult, it will be emotional, with the support for home team being what it is.
"Like I said, we always prepare for a win, we want the win, but in the [context] of the group, knowing where we want to go, it's too early to speak of a 'must win'. It would be ideal, but the problem is the opposition on the other side.
"I feel I always need a result, no matter where. You always need a result in football to get confidence, to get the support, the belief, and especially after a defeat.
"Even if everyone in camp truly believed that this is the way to go forward and we made a good performance, you just need it for yourself and to show straight away a reaction."