He added: "I have been involved in some great derby matches over the years, but I will remember this one forever."
Keegan also voiced his praise for Shaun Goater whose two goals took him to 100 in City's colours, saying, "We gave Shaun a fitness test this morning and I was a bit worried because we don't want him to get a knock on his knee and miss three months.
"In the end, we decided it was worth it and that paid off. He has struck up a pretty good understanding with Nicolas Anelka. I don't think you can get two more different players. But even against the likes of Valencia and Real Madrid, United won't have a tougher time than that."
MAN UTD MATCH REPORT