Under-fire Manchester United manager Jose Mourinho is “obsessed” with tarnishing his reputation, according to former Real Madrid president Ramon Calderon.The 55-year-old tactician has established a standing as one of the finest coaches in world football, with league titles and European success having been tasted in Portugal, England, Italy and Spain.Mourinho has, however, countered his many highs with a number of lows, with it in his nature to come out fighting when questions are asked of his methods and ability to deliver results. Article continues below Editors’ Picks Man Utd ready to spend big on Sancho and Haaland in January Who is Marcus Thuram? Lilian’s son who is top of the Bundesliga with Borussia Monchengladbach Brazil, beware! Messi and Argentina out for revenge after Copa controversy Best player in MLS? Zlatan wasn’t even the best player in LA! He currently finds himself in that position at Old Trafford, after overseeing United’s worst start to a season in 26 years, and Calderon believes it is an inability to steer clear of controversy which will be concerning the Red Devils board.The ex-Madrid supremo, who got a close look at Mourinho during his time at Santiago Bernabeu, told talkSPORT: “Undeniably his track record speaks for itself, it’s the one of a winner and a very successful coach.“And because of that he could have had the football world at his feet, in my opinion.“But it appears he’s obsessed with staining it with so many controversies and problems.“And then he blames the world for everything when he loses. It’s a pity.“His track record is very, very difficult to get and it’s something he is now staining continuously.“I remember the great Alfredo Di Stefano [the Real Madrid legend, former player and coach], he used to tell me that a great coach could never complain about referees, injuries, bad luck or any other circumstance – that was reserves for the mediocres.“That was very self-explanatory about what a great coach must do. It’s clear that Mourinho is having many problems, even I’m sure among his followers.“Maybe they don’t understand what he’s doing or what he’s saying. And on top of that – the results.“When you win, everything can be acceptable. But when you’re losing, and when you’re coaching a team so great as United, then fans can be disappointed and at the start of the season with only three points out of nine – that can be a problem.“I don’t know what the owners think about that, but of course they must be worried.”Mourinho is certainly dividing opinion at present, with former United stars such as Bryan Robson, Gary Neville and Ryan Giggs calling for him to be given more time.Others have questioned his ongoing presence, with Lee Sharpe expecting the Portuguese to be gone by Christmas and Paul Parker suggesting that he is dragging underperforming Red Devils players down with him.