The first leg ended 5-2 at Anfield, meaning the Giallorossi need a 3-0 home victory to go through.
“I've never played in Italy before but I know it will be intense there," said Scotland international Robertson in the Liverpool Echo.
“They were 4-1 down from the first leg and everyone was saying it was just a standard game for Barcelona to go through, but they put on an unbelievable performance at their place to put three goals past one of the best, if not the best, teams in Europe.
“To score four goals against Barcelona over two legs is fantastic, but we also know what we did in our tie."
He added: "We got the better of Manchester City by beating them twice, so I think both teams will treat each other in the right way, but hopefully we can stand up to their strengths and exploit their weaknesses."