He did it once I think but it was months after RL had been played there. Pretty sure it was after an FA Cup tie that they lost.
EDIT - There you go
[i'The biggest club in the world and they have to play rugby every bloody November'
When Fabien Barthez conceded after failing to fool West Ham's Paolo Di Canio into believing he was offside in an FA Cup fourth round match at Old Trafford in 2001, he was widely blamed for his team’s 1-0 defeat. But Sir Alex had different ideas.
Stop, I can see a rugby divot...but Fabien Barthez did not fool Paolo di Canio
Referring to the Super League Grand Final played months earlier, he raged: ‘I can't believe Manchester United have allowed rugby matches to be played on the pitch. The biggest club in the world, and they have to play rugby every bloody November - and the pitch is a mess after it.’
In an impressive display of avoiding the bleeding obvious, Fergie also lamented insufficient injury time (four minutes were played) and the lack of a penalty award (because Manchester United don’t get enough of them at Old Trafford).
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