Manchester United manager Sir Alex Ferguson refused to comment on Rafael's red card in the goalless draw against Tottenham.
The Brazilian was harshly shown a second yellow card for a foul on full-back Benoit Assou-Ekotto after having earlier been booked for a challenge on Wilson Palacios.
"I don't need to discuss that, you can see for yourself," he said. "I don't need to discuss the referee."
Ferguson went on to praise his defenders, adding: "I think they were particularly good. It could be a really thrilling end to the season. Tottenham are not out of it.
"It's about winning games and keeping your nerve and today, defensively, we kept our nerve."
The game was Ryan Giggs' 600th league appearance for the club and Ferguson said of the veteran Welshman: "He's an incredible human being and an example to anyone that wants to use him as a role model."