Ferdinand returned from a back injury, in the game that Paul Scholes decided with his second half goal.
Rio said: “I thought it was offside but Scholesy told me he thinks he played him on. Fortunately we got away with it.”
“Overall we deserved our win, we created chances and we could have maybe scored a couple more.
“Today under the conditions and circumstances I thought we played some good stuff, and Scholesy scored the all-important goal.”