Chiefs assistant coach Wayne Smith was disappointed with the champions' preparation in the build-up to their shock loss last week.
The 2012 and 2013 Super Rugby winners lost 19-15 to the Force in Perth in a match they went into as favourites.
"The preparation was not as good as it has been," said Smith.
"We let our standards down in every area. The Force are proving a genuine contender, they were almost Chiefs-like in the way they played," Smith said.
The Chiefs are yet to really fire on all cylinders this season, with narrow wins over the Crusaders and Highlanders coming before a 36-20 win over the Stormers and the loss to the Force.
Now the champions travel to Loftus to face the Bulls, with Smith conscious of their effective lineout run by Victor Matfield.
"It never comes easy at Loftus. Every win you have there is a special occasion," added Smith.
"There's a fair bit of anxiety this week and when you prepare like that the players know every place is up for selection competition.
"We are up against the best lineout in the competition which has got the best lineout forward [Victor Matfield] running it.
"We will have to execute better under pressure. We have got to step up. If we go in like we did against the Force we'll have no show.
"It is always difficult after a loss like that. You can talk all you like, you have to perform on the field.