SIR Alex Ferguson has revealed he feels he let his wife down after not telling a Rangers director to "f**k off" after being asked if his wife is Catholic. 

The 79-year-old was earlier quizzed on his wife Cathy's religion before he signed on at Ibrox in 1967. 

The ex-Manchester United and Aberdeen boss said: "When I signed for Rangers, one of the directors asked me about Cathy.

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"He says, 'I believe she is Catholic, were you married in a chapel?'

"I said, 'No we got married in the registry office,' and he says, 'Oh, that's okay.'

"I should have told him to f*** off. I let myself down and I let my wife down, that was the most important thing. She was a devout Catholic."

The pair tied the knot in 1966 after first meeting in 1964.