Manchester United boss Sir Alex Ferguson admits they face a tough task to overturn their 2-2 draw with Porto last night.

"No British team has won there, so it is going to be difficult," admitted Ferguson.

"But we are used to being first and we need to be first again because we have to win."

Porto have only recorded five wins from their 11 previous home encounters against English teams, which does give Ferguson some hope.

However, they held Atletico Madrid comfortably enough in the last round after recording exactly the same scoreline in their first meeting with the highly rated Spanish outfit.

And Ferguson accepts United have no-one but themselves to point the finger at for the mess they find themselves in.

"We only have ourselves to blame," said the Red Devils chief.

"To get a goal late on is quite a normal situation for us. But the one we gave away was absolutely terrible.

"You couldn't say it was a great goal or a manufactured goal but we just made the kind of mistake we are making at the moment."