Daniel Farke is expecting a very tough test when his Norwich City side taken on Wycombe Wanderers in Carabao Cup Round Three on Tuesday.
After wins over Stevenage and Cardiff City in previous round, City travel to Adams Park to face a side they have only played three times before.
Wycombe were promoted from Sky Bet League Two last season and Farke says they have plenty of momentum, meaning his side face a stern test.
"I expect a pretty tough test and a really, really difficult game," he said. "We will have a few changes and when you have perhaps a bit more than just two or three changes it could be that it affects a bit in your game rhythm.
"There will be lots of rhythm around the place tomorrow because Wycombe got promoted, they are in a good mood because of promotion.
"They knew in their new league that they would fight against relegation so it's quite normal that they are not the league leaders at the moment.
"I think they proved that they are hard to beat. They have probably had a few too many draws but in the competitive games they have just lost one of their last nine games.
"For them, it will be more like a game of the year because they know they are able to beat us and go through to the next round and then have a big chance of getting Arsenal, Chelsea, Man United or whoever.
"I think they will be there highly-motivated with the best team they can choose and they will have lots of support from their home fans."
Farke's City side have won three games in succession and he is keen his team's focus and concentration does not waiver as they aim to progress in the Cup.
"In the Cup, everything is possible," he added. "We proved it at Cardiff where we beat a Premier League side or in last season where we were close to beating Chelsea or Arsenal.
"They have a chance against us. I'm pretty sure it will be an unbelievably tough test and we have to put in a really good performance to go into the next round.
"We need the same level of concentration and focus like in the last few games. The lads are experienced to judge all the games in the right way."