"We mustn't listen to voices from outside," he told the club's website. "We know exactly what we have to improve and we need to pick holes in our own performances because we have always been able to bounce back.
"It's not a time for words, we just need to go out there as a united group. Just a matter of days ago against Palermo we played brilliantly, but we still lost because the big incidents went against us.
"Because we are European champions everyone plays harder against us. A lot of the time, the results don't tell the true story."