Middendorp has led Chiefs to the summit of the Absa Premiership table in his second stint at the club with just a handful of fixtures remaining this season.
However, after a shock defeat to AmaZulu on Saturday, the Soweto giants' seven-point lead over Masandawana could be cut to a solitary point should Pitso Mosimane's side beat Stellenbosch tonight and Orlando Pirates next week.
And amidst the title race drama, a section of Amakhosi fans have come out to express their unhappiness at the team's style of play, with Chiefs profiting from dead-ball situations in their pursuit of league glory.
However, Buckley, who starred under Middendorp at Armenia Bielefeld and VfL Bochum in the Bundesliga, has stressed that none of the noise will affect the German tactician.
"Direct football? Let me tell you something, when you are a coach, you can't please the whole world," Buckley tells snl24.com/kickoff.
"At the end of the day, you have a championship to win. If you play the s***test football ever and win the championship, are those same fans going to talk about you next year about how s*** you played or how you won the league?
"That's why I can tell you, Ernst doesn't give a s***. He doesn't give a damn what people are saying! Because he has one vision and I'm telling you he will go by that vision, the goal that he wants.
"He won't change anything, he knows what he wants. It's working and he will stick by it. Whoever tells him he must play this fancy football, it will go in here and out there."
Chiefs host sixth-placed Bidvest Wits in their next league fixture on Wednesday, 18 March at FNB Stadium.