Fernandes proved the matchwinner in yesterday's FA Cup win against Liverpool.
"Eric, when we won the FA Cup in 95-96, he was the difference. In the big games he would every often be the difference," Giggs told Stadium Astro.
“Fernandes undoubtedly has had a massive impact on United. There have been comparisons with Eric and the impact he has had – not just his quality but the fact everyone around him seems to be playing better.
“You can just see he is a winner. When things aren't going right he is telling other players, he's having a go at the referee, he is constantly moaning and he wants to win.
“He has been a revelation since he came to United. Like all top players, he has to do it in the big games and then win trophies."