Manchester United legend Sir Alex Ferguson as been labelled as his “Father of Football” by Real Madrid superstar Cristiano Ronaldo, who reveals in the documentary ‘Secrets of Success’, to be aired on the BBC at the weekend, that it is due to the compassionate side of the Scot.

Sir Alex was known for his no-nonsense approach when dealing with unprofessionalism or lack of commitment within his squad.

The fiery Scot, however, also had an incredibly compassionate side, as revealed the Portugal super star Cristiano Ronaldo.

The Portuguese revealed in the documentary ‘Secrets of Success’ that how Sir Alex had given him compassionate leave to visit his sick father during the season.

Ronaldo concluded the story by labeling the former Manchester United boss as a unbelievablea and said that he was his a father of footballa .

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The video clip of Ronaldo’s story on Ferguson can be seen below: