Wigan stunned United last week.
Ferguson enthused: “Wigan are playing very well at the moment and I wouldn’t be surprised if they beat Arsenal on Monday. If they can get a goal they can win that game. I think if they had a recognised goalscorer they would be comfortably mid-table by now.
“Roberto Martínez produces teams that play good football. He did it at Swansea and he is sticking to his principles at Wigan. You have to give him credit for that, it’s not easy when you’re down there in relegation trouble.”