Pep Guardiola might be revered as one of the best coaches in world football, but funnily enough, he's not all that highly thought of over at Manchester United.
It's fair to say Jose Mourinho isn't his biggest fan. After all, it's not all that long since the Red Devils boss claimed his old rival had no hair because he didn't enjoy football, so it's no wonder their rift is yet to heal.
However, it's not just the Special One who hasn't got much time for the new man in the City dugout.
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United legend Peter Schmeichel has now hit out at Guardiola, insisting he was "lucky" at Barcelona and "boring" at Bayern Munich.
"He was very lucky he had the players at Barcelona but he was clever in what he did," the former stopper told Omnisport, via the Mirror.
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"The Premier League is a completely different animal to any other in the world [though]. It just goes on and on and on, you feel it never stops, even in March you have 12 games to go, you think will this ever stop?"
Guardiola managed just the two Champions Leagues, three league titles, and two Copa del Reys during his time to Catalonia, so it does beg the question what he has to do in the Premier League to impress some of his critics.
Admittedly, a line-up consisting of the likes of Lionel Messi, Andres Iniesta, and Xavi may have helped along the way, but that's not to say Guardiola shouldn't receive credit for his unbelievable record.
After leaving Barca, the 45-year-old headed to Bayern Munich, but Schmeichel has a similarly scathing assessment of his time in the Bundesliga.
"He was okay at Bayern Munich. I have to say he was okay," he added.
"For me, personally, he changed a really good, entertaining team to be become more boring to watch.
"Whereas [Sir] Alex Ferguson's first priority was 'we have to be able to score goals' - for most coaches that's the priority - with Pep it's possession, I want to have as much possession as possible."
Of course, there's every chance that Schmeichel is simply upping the ante ahead of this weekend's Manchester derby and it's unlikely the City boss is going to pay too much attention to his comments.
In fact, Guardiola will be focusing on silencing Old Trafford in one of the most fiercely-anticipated derbies in living memory.
Who will win the Manchester derby? Have your say in the comments.