Heynckes last charge of Bayern between 2011 and 2013.
"They have asked me to take over as a coach until summer 2018".
Of all the players (and there were plenty) whose performances dropped during Ancelotti's tenure, Muller's was by far the most obvious as he went from an indispensable member of the side to a player ill-suited to their system and tactical setup.
As for the league, there's an awful long way to go.
Fans and club should not expect too much under these circumstances.
Bayern is lagging in third place on the Bundesliga tables, five points off leaders Borussia Dortmund. We'll have to wait and see.
Jupp Heynckes played a key role in Jerome Boateng's development.
He returned for a brief five game stint as caretaker manager in 2009, winning four and losing none of his five matches at the helm. He will certainly be happy to see him return. Bayern's president Uli Hoeness is reportedly the main man driving Bayern's pursuit of Nagelsmann.
Ancelotti traveled to Jerusalem to coach children for a coexistence group just days after being fired from Bayern Munich.
Kroos left his boyhood club of Bayern Munich three years ago to join the La Liga giants. Given their history, I wouldn't be too optimistic about it.
And according to German paper Bild, Heynckes looks set to be reappointed until the end of the season.
Liverpool boss Jurgen Klopp was also mooted as a potential candidate, as Bayern weighed up their options.