Manchester United star Cristiano Ronaldo says the return of Rio Ferdinand was critical in their victory at Porto.
"Rio did fantastic, and Vida, and Sheasy and Evra - but Rio makes it comfortable for the other players," he told MUTV. "He's mature, experienced and the defenders were great. We played compact, and it's very tough to score against us when we are together.
"The last five or six games we didn't play great and I hope this changes it. We started the season fantastically, after which we have gone down a little bit but I'm very confident and I'm looking forward to being back to my best and my colleagues as well."