Sunderland boss Ricky Sbragia acknowledged that getting anything from their next game at home to Manchester United will be a very tough ask for his relegation-haunted team.
However, the Scot suggested that the Black Cats' best chance of pulling off a surprise result will be to follow Porto's lead and attack the Red Devils from the onset.
Porto, who knocked out United in the Champions League last-16 five years ago, did exceptionally well to put the title holders on the back foot, both for lengthy spells of Tuesday's encounter at Old Trafford and in the sense of their position going into the decisive second leg in Portugal.
Sbragia told Sky Sports News after watching the thrilling 2-2 draw, "Porto surprised them. They attacked them early doors, got the goal and had a couple of chances and they made the game big as well.
"They worked extremely hard against Manchester United, but I felt the longer the game went on, Manchester United started taking charge of it.
"They got back to 2-1 and the game, for me, would have been over. But credit to Porto, they came back and scored late on."
Sbragia, whose side sit just one place and three points ahead of the bottom three, concluded by acknowledging that United will take some beating no matter what strategy his own team employs.
"They are a top team and we know it's going to be very difficult," he added.
"We watched them against Porto last night and watched them against Villa, and they are a good team. They are an attacking team, they score goals.
"You just don't know what sort of team they are going to put out on Saturday, but we know it's going to be a very difficult game."
Derek Wanner, Goal.com