Yuvraj's brother Zoravar Singh's wife Akansha Sharma - who was a contestant in a popular TV reality show - had alleged that the left-handed all-rounder had indulged in drugs. Zoravar and Akansha live separately.
"What nonsense is she talking? It's absolute rubbish", Yograj, who represented India in one Test and six ODIs, was quoted by "Deccan Chronicle".
"I'm a father of four children and none of them are drug-addicts. Yuvraj, as also my other three children, are like lions. They don't eat grass...," added Yograj Singh.
Yograj also advised the lady to sort her personal problems first.
"The lady who is accusing Yuvraj, should put her own house in order before alleging something", said Yograj.
Yuvraj was on Wednesday (November 2) ignored for the first two Tests against England despite performing well in the domestic circuit.