"League form has nothing to do with the Champions League, but in my opinion it is the worst possible result for us," Guardiola said.
"Bayern have won the European Cup four times and have won their domestic league many times, and it is now sure they will arrive with even greater motivation," he told reporters.
The Catalans, who have already reached the King's Cup final, maintained a six-point lead over chasing Real Madrid with nine games left.
"After the break for internationals the win over Valladolid was vital to get our competitive edge back," Guardiola said.
"The players gave their all and the shouts of happiness you could hear from the dressing room afterwards show how important we felt the three points were."
"We are not afraid of Barcelona," said Klinsmann. "The players know that the whole world will be watching and they will want to show what they can do."
"The players must know that there will be consequences at some point," he told the club website (www.fcbayern.de).
He said he wanted to see "greater sacrifice and determination."
Barcelona: 1-Victor Valdes; 20-Daniel Alves, 4-Rafael Marquez, 3-Gerard Pique, 5-Carles Puyol; 6-Xavi, 15-Seydou Keita, 8-Andres Iniesta; 10-Lionel Messi, 9-Samuel Eto'o, 14-Thierry Henry
Referee: Howard Webb (England)
