Jose Mourinho made a mistake returning to Chelsea for a second spell, according to Alex Ferguson.
After winning two Premier League titles with the Blues during a three-year tenure from 2004 to 2007, Mourinho departed for numerous jobs throughout Europe.
He spent two years at Inter Milan, winning as many Serie A titles and ending his reign as a European champion after beating Bayern Munich 2-0 in the 2010 final.
He then moved to Real Madrid, where he interrupted Barcelona’s dominant reign by winning one La Liga in his three years in Spain.
The Portuguese left Real in 2013, and while he was widely reported to be interested in the United job – which would become vacant as Ferguson was retiring – he instead returned to Chelsea.
The Blues finished third in their first season with Mourinho back at the helm, before the 53-year-old won his third Premier League title in the 2014/15 season.
But his second spell at Stamford Bridge ended ignominiously, with the club battling relegation and embroiled in constant controversy.
Ferguson believes that Mourinho’s decision to return to Chelsea was a mistake.
“I thought Jose was wrong to go back to Chelsea, I really do,” he said.
“I think it’s always difficult going back to somewhere for a second time.
“The ability, charisma and personality, his success is high, won a European Cup twice with different clubs, won a Europa [League] with Porto, winning titles with all the teams he’s managed. His record – you can’t ignore that.”