HE is the most successful football manager of all time, so who better to offer leadership advice than Sir Alex Ferguson.

The former Manchester United boss was in conversation with fellow Scot, broadcaster Nicky Campbell, in front of a sell-out crowd at the Royal Concert Hall in Glasgow.

The event was the first of two talks on leadership coinciding with the publication of Sir Alex's new book, 'Leading', which draws from the experiences of his 38-year career.

The second talk will take place at Aberdeen’s Music Hall on Thursday.

Among the revelations in his new book, Sir Alex named the four players he managed that he considered to be "world class" talents.

The Scot wrote that midfielder Paul Scholes and attacking trio Eric Cantona, Cristiano Ronaldo and Ryan Giggs were the only footballing greats he had coached, describing Ronaldo as a "complete genius of a player".

Wayne Rooney, David Beckham, Roy Keane, Carlos Tevez, Rio Ferdinand and Peter Schmeichel all received honourable mentions as "great players".

Sir Alex stood down from Manchester United after 26 years in charge in 2013.

He said recently that had it not been for the death of his wife Cathy's twin sister he would probably have carried on.