Daniel Farke expects Brentford to provide his Norwich City side with their toughest assignment of recent times in the Sky Bet Championship.
Brentford had an impressive start to the season and sat in second position after seven games, following a 2-0 victory over Wigan Athletic at Griffin Park on September 15.
However, after no wins since and the loss of manager Dean Smith to Aston Villa, the Bees are currently 15th.
However, City boss Farke says the west London side, now under the guidance of Thomas Frank, should not be underestimated.
"It could be a small advantage that we've had one more day to rest. In general, I was not pleased with their [last] result and the fact that they conceded four goals.
"For me, I made clear in the meeting with the players that it will be our toughest game in recent weeks and I get the feeling we have to improve our performance level in order to win these three points.
"Brentford played, in the beginning of the season - perhaps together with Leeds - the best football in the division, without any doubt.
"They've blown many, many teams away with three/four/five goals. They were pretty near the top of the table but their form has slipped away in the last weeks.
"But it was more like fine margins. They had two difficult away games at Derby County and the Emirates [Stadium, v Arsenal in the Carabao Cup] with two losses.
"Then they played two home games and it was unlucky that they had just two draws. Then it's four games without a win and then you lose Dean Smith's influence.
"But his philosophy is still there. In their first game without him, it's normal that everyone is a bit nervous. Then they conceded a red card and they lost a home game against Bristol City.
"The next game, [Chris] Mepham, a key player for them, was suspended and they conceded several goals. Mepham will be back [tomorrow] and I'm sure they'll be speaking about doing a response tomorrow.
"They will be there with a pretty good performance because, for me, this is a side that can be outstanding."
Farke added that his City side will have to perform at the top of their game to take the three points at Carrow Road.
"We have start even more concentrated than we were against Aston Villa. We have to be even more effective in using our chances.
"I'm pretty sure Brentford will be there with pretty good defensive behaviour. They also have so many threats in their offence so we have to reach our 100% performance level to win points from this game.
"We are really, really respectful of them."