Roberto Martinez believes Aston Villa's attacking instincts are something that can be exploited when Everton head to the Midlands on Saturday.
The Blues have won four of their last five league games but now face a Villa side showing clear improvement from last season's struggles.
An opening day 3-1 victory over Arsenal at the Emirates and a 3-2 home win over Manchester City last month are evidence of the potential in Paul Lambert's ranks.
And Martinez insists his Toffees must be on form to avoid similar disappointment.
Speaking at his weekly press conference on Thursday, the Blues boss said: "We won't underestimate their quality, that's for sure. Anyone that can beat Arsenal or Manchester City deserves huge credit. When they have everyone fit and available, they are as good as anyone on their day.
"They have a lot of young players which shows a lot of bravery - that brings you energy and sometimes a dangerous naivety, which is sometimes needed in the modern game.
"We know what we are going to face on Saturday.
"They have had really difficult games [so far]. I think it's fair to say they are a very brave team, very flexible tactically. They always cause a threat and try to win the game, which is refreshing at times."
"I always have great admiration for managers who can be flexible with their tactical approach. Clearly, Paul Lambert has achieved that at Villa."
Villa have Christian Benteke back fit for the weekend, with Gabriel Agbonlahor and Andreas Weimann also turning in some impressive showings this term.
Martinez added: "You look at Villa in terms of energy, the way they are set up and the way they can be flexible and reorganised. Their front three have incredible understanding and threat.
"It makes for a dangerous side and, unless you are at your best, you cannot compete at Villa Park this season."
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