"On the flip side, there is Moyes' lack of European experience. There is also the lack of experience of working with star players. The bigger the ego, the harder they are to manage -- that is a special art.
"Having said that, Moyes deserves a big job -- arguably it wasn't realistic for Everton to qualify for the Champions League."
Over the last few weeks the coach of Spanish club Real Madrid has been strongly linked with a return to the English Premier League as his old team Chelsea seeks to replace interim manager Rafael Benitez.
Mourinho offers the complete package as manager -- an unparalleled track record of success allied to an ability to motivate players that inspires loyalty long after he has moved on to new teams.
He has the knack of getting journalists to eat out of his hands as he delivers a succession of quotable quotes. No coach gives better press conferences than Mourinho, evidenced by his pre-match briefing ahead of Real's game with Malaga this week as he skilfully squashed criticism from one of his own players and defiantly gave away no clues about his future.
However, given he is the only coach to win European football's top three leagues, Mourinho's time at the Bernabeu has been mixed.
The 50-year-old Portuguese has won one La Liga title, last season, but looks set to miss out to archrivals Barcelona this time around. He has also guided Real to a Spanish Cup win, while his team will play city rivals Atletico in this year's final.
But Mourinho's quest to win the European Champions League for a third time in his career has faltered at Real, losing in the semifinals for three years in a row -- last month being beaten 4-3 on aggregate by German club Borussia Dortmund.
Mourinho has made no secret of his desire to return to England, with media reports claiming he has already negotiated a return to Chelsea at the end of the season.
His previous spell in charge saw him lead the Blues to their first top-flight title for 55 years in 2005. He won five trophies in his three seasons in London.
Mourinho forged his reputation when his Porto side famously knocked Manchester United out of the European Cup at Old Trafford in 2004, running down the touchline to celebrate the late clinching goal. Porto went on to win the Champions League that year.
After Porto and then Chelsea, Mourinho coached Inter Milan, winning the Champions League, the Italian league title and the Italian Cup in his second and final season with the club, before leaving to join Real.
But with that unimpeachable track record of success, comes volatility.
As well as the incendiary media conferences, Mourinho has occasionally overstepped the mark -- no more so than in his 2011 altercation with the now Barcelona manager Tito Vilanova, when the Portuguese coach poked his opponent in the eye when the Catalan was Pep Guardiola's assistant.
"I'm there to win," Mourinho, who often refers to Ferguson as "The Boss", told CNN last year as he reflected on his coaching philosophy.
"I'm there with my team to try to win. I'm there and I live the game, I live the match as if it was the last match of my career.
"So people look at me and they see what they see. After that, in press conferences, it's the other place where people know me.
"In press conferences, there is still a match to play. Before the match, press conference is pre-match and after the match, press conference is post-match, but it's a match."
Karlsen's verdict: "Mourinho is the ideal candidate. He is the only manager who can offer you a guarantee of success.
"With a manager with a lesser profile, if the next season doesn't start well then they will come under immense pressure.
"But given Mourinho's track record no-one can criticize Mourinho. He has proven that he could work under the most intense pressure.
"That is the biggest threat to a manager -- the environment that they are working in -- and when the pressure becomes too much, you become reactive rather than sticking to the plan.
"You would never have that problem with Mourinho.
"As for whether Mourinho's combative personality would damage the United 'brand,' he is clever enough to tone it down. Don't forget that Ferguson often thrived on conflict as a way of putting pressure on United's opponents.