The versatile attacker was rather surprised by Madrid's negative tactics and is determined to turn things around in the return
The Bundesliga side enjoyed the majority of possession at the Bernabeu as Carlo Ancelotti's men were seemingly happy to sit back and defend, but the guests were unable to take advantage of their dominance and slumped to defeat as they found no reply to Karim Benzema's first half strike.
"I think Real Madrid showed us massive respect," Muller was quoted as saying on Bayern's official website.
"Imagine this: Real Madrid pull everyone back to within 40 yards of their own goal on their home ground.
"We kept on battering away and we were close to scoring at the end. We’ve not done so and we have to make up for that in the return.
"We have a huge task ahead of us."
The second leg is scheduled to take place at the Allianz Arena on April 29.