By ESPNSTAR.com staff
Die Roten have made a fantastic start to the season, amassing an amazing 42 points from 17 games in the Bundesliga to sit atop of the table, nine points clear of nearest challengers Bayer Leverkusen and a massive 12 points ahead of reigning champions Borussia Dortmund.
Heynckes and his men have also progressed to the quarter-finals of the DFB-Pokal, and booked a meeting against English outfit Arsenal in the last-16 of the Champions League after easily topping their group.
And Muller has credited Bayern's current good run of form to Heynckes, who he believes is trying to make up for the Bavarian champions' hat-trick of second-placed finishes last season; Die Roten finished the previous campaign runners-up in the Bundesliga and lost in the finals of the DFB-Pokal and Champions League to Dortmund and Chelsea respectively.
"It is not common to see a 67-year-old coach still work with such passion," Muller told Spox.
"The two final defeats [in the DFB-Pokal and the Champions League] have made him extremely greedy.
"He wants to do it again, but on a positive note this time. It's fun to watch him [in training].
"The team is stable and so well-built because no coach has come in and tried to force something completely new upon us. Nothing has needed to be reinvented."
Muller also pinpointed Heynckes' man-management skills as the key in their recent successes, expressing his belief that future Bayern managers should also possess such traits.
"He must be able to work well with the players, which is extremely important trait to coach a top team," Muller added.
"He must also give everyone their say and cause arguments.
"It should be viewed as an honour for any coach to coach Bayern."
Bayern are currently in the midst of their winter break and will return to action on 19 January against Greuther Furth.