"We have unfinished business with Porto," said Ferdinand. "I'm excited about the game and looking forward to it.
"It's a decent draw but at this stage of the tournament whoever you play is going to be difficult. I'm pleased to have avoided the English teams.
"Emotionally and physically it would have been draining because there's so much that goes along with playing English sides. We know that from playing Chelsea last season. But we don't look too far ahead at the semi-finals.
"We're just focused on the quarter-final and won't disrespect Porto by looking at who we can play in the next round."