The Brazilian midfielder feels Spurs have quickly moved past that November 24 debacle in the North West, though, and has backed manager Andre Villas-Boas to guide them to a top-four Barclays Premier League finish.
Sandro: "It was my most difficult moment in football.
"Six-nil was so bad.
"I felt on the pitch I couldn't help.
"Everyone had to be close after this, because everyone talked about this game.
"Against United we put more passion and we were stronger on the pitch, and this helped.
"We are doing well now, so I think it's passed.
"We are comfortable as a team: we play for him (Villas-Boas) every game.
"We are ready to move on and keep strong to put Tottenham in the top four."