"Certainly we go in as underdogs," Fulham manager Roy Hodgson told reporters on Friday. "We're realistic but ... if we did want to take solace from the fact this can be done, we've got Portsmouth last year.
"In the Cup everything is possible."
"Ronaldo is a player I respect enormously," said Hodgson. "He's got wonderful ability and if we're going to keep him quiet, which is a very difficult thing to do, we'll have to be very good."
Hodgson side-stepped Arsenal manager Arsene Wenger's comments that Ronaldo's "arrogance" can sometimes make him the target of bad tackles.
"He (Ronaldo) has got a lot of confidence," he said. "Someone who is very confident in his play would always run the risk of being called arrogant."
"(Ronaldo) goes at such speed that when he loses control of the ball and people are in there making attempted challenges, the referee has a difficult task," he said.
"Their home record is good and we're in for a tough game," said the Scot.
