After beginning his career with local sides Fivemiletown United and Ballinamallard United he moved to England and played for Hull City, Wigan Athletic, Manchester United,West Ham United and Derby County.
Signed for Manchester United in July 2001 for an undisclosed fee believed to be £2.5 million. Carroll gained his greatest infamy for the "goal that never was" against Tottenham Hotspur; a speculative shot from the half-way line by Pedro Mendes that Carroll dropped well behind his goal-line then scooped back into play. The referee and his linesmen were unable to verify that the ball had gone over the line. The below video shows this.
Received a Red Cross Humanitarian Award for his kindness to a child with leukaemia (November 2001).
He has represented Northern Ireland 19 times at international level.
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