They are Dennis Irwin, and Roy Keane.
Didier Drogba has scored one goal against Manchester United, in the 2007 FA Cup Final.
I can think of Mark Hughes, scored for Manchester United against Chelsea in 1994 before moving to them a season later. Frank Stapleton scored for Arsenal against Manchester United in the 1979 Final and moved to United in 1981. Kevin Keeganscored in 1974 for Liverpool against Newcastle United, and went on to play for them in 1982. That's all i can think of
Eric Cantona
The first goal scored in the 2009 Champions League final, which was the last time Barcelona and Manchester United met each other, was scored by Samuel Eto'o from Cameroon. Barcelona went on to win the match 2-0, with the second goal scored by Argentina's Lionel Messi.
Barcelona won with a 3-1 win over Manchester United. Wayne Rooney scored for Manchester United. Messi, Iniesta and David Villa scored the Barcelona Team
Norman Whiteside Norman Whiteside
Actually there were two players suspended for the 1999 final, Paul Scholes and Roy Keane
Eric Cantona scored the brilliant goal for Manchester United in the FA cup Final 1996 against a hopeless Liverpool and helpless David James
Nicky Butt has never scored in a Cup final, for Manchester United, England, or any other club he has played for. He has scored once at Wembley for Man Utd, in the Charity Shield against Newcastle United in a 4-0 win.
Cristiano Ronaldo joined Manchester United from Sporting Lisbon in the summer of 2003. In his first season at the club, he scored a total of 6 goals in 40 games - 4 in the league and 2 in the FA Cup (which United won that season, Ronaldo scored a goal in the final).
Everton. Kevin Moran got sent off , But Manchester United still won by a goal scored by Norman Whiteside.
Michael Owen