Antonio Conte has told his Chelsea players to pay attention to Huddersfield's counter-attacking threat at John Smith's Stadium on Tuesday night.
Chelsea come into their Premier League clash against David Wagner's side having lost 1-0 away to relegation-battlers West Ham on Saturday, which resulted in Conte saying the Blues are no longer in the title race.
Huddersfield, meanwhile, beat Brighton 2-0 at home at the weekend and also stunned Manchester United when they defeated Jose Mourinho's side 2-1 at John Smith's Stadium in late October.
Wagner's men were also only narrowly beaten by league leaders Manchester City last month, and Conte has urged his Chelsea side to be wary of the hosts on Tuesday night.
He said: "We are facing a team in a good moment of form. In the last game they played a great game against Brighton.
"We must pay great attention to the counter-attack because they have fast players.
"They are in a good moment of form and we must be very good to be more clinical in this game, because in the recent period we weren't clinical."
Wagner, meanwhile, said welcoming Chelsea to John Smith's Stadium will be more like a Cup tie than a Premier League one.
In Pictures | West Ham vs Chelsea | 09/12/2017
"If you can score first it puts a lot pressure on the opponent," he said. "We have experience and with our supporters backing us it is a totally different game. It's like a cup tie.
"We have to produce our top performance. We must be focused and concentrate every single second. We cannot give one easy chance away.
"What we can expect is we make it as uncomfortable as possible, as we have done at all the home games with our supporters, and then we will see what happens."
