Karanka's task is to help his side rediscover the form that saw them go unbeaten in their opening three Premier League fixtures.
"I've given the players a tough week in training. Collectively, they can't make mistakes like they did last week," the Spaniard said.
"I don't want to blame just one or two players. They have learned a lot in the past week, they've learned a harsh lesson.
"We have no midweek games or distractions so it gives us longer to sort things out. In the Championship, we just went straight back out there."