Gareth Southgate admits England cannot be deceived by their dominant start to the Euro 2020 qualifying campaign because they will face far sterner tests than Bulgaria provided in Saturday's 4-0 demolition at Wembley.
Harry Kane scored his second England hat-trick and also set up Raheem Sterling's strike as Southgate's side cemented their position on top of Group A.
With three successive victories and 14 goals to their credit, the 2018 World Cup semi-finalists already look odds-on to qualify for Euro 2020.
Their next qualifier is against second placed Kosovo, who beat the Czech Republic 2-1 earlier in the day, at Southampton on Tuesday and Southgate claims it will provide a tougher examination than lacklustre Bulgaria could manage.
But it is next year's tournament, which features several games in England, that Southgate was looking ahead to when he conceded he learns more from training sessions than he does these routine group matches.
"We have not had the tight, tense matches that the Nations League provided as of yet, that really we learnt so much more from," Southgate said.
"So, therefore, we've got to do that in training and the challenge of training has got to be so high that we learn from those moments and we can see what the players are capable of.
"We have genuine competition for places, there are five or six guys you would expect to see on the team-sheet but outside of that it's very difficult to call."
"I think we're competitive with probably eight teams. I think that on our day, we can beat those teams, but equally the Dutch showed (in the Nations League) that they're capable of beating us on their day and I think it really is a tight grouping of probably eight teams."
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