Ferguson admits United will have to be on guard against Michu today.
"It was first-class business by Swansea to cherry-pick Michu. I'd never even heard of him - I think I should have a word with my scouting department," joked the United boss.
"He can play up front or drop into the middle, so it could give us a problem. We need to be aware. He's shown he is a good finisher, his goals against Arsenal were composed even when he went through on the keeper."