"For sure it will be the real test of where we are at the moment," said the Brazilian.
"It is a really important game for us, and we must gain points.
"We know against top teams anything can happen but we need to be strong enough to go into these games with confidence.
"Or course playing in Old Trafford is really difficult but we have to believe that we can go and win also. And if we keep doing our job as we are, we will be much closer at the end of the season."
