#4 Niko Kovac
The Bayern hierarchy has always believed in bringing back players in management and administrative roles thus allowing them to settle down quickly in their new roles due to being familiar with the system.
Bringing back Heynckes is a testament to this mentality of theirs and in that way, Niko Kovac is a manager who perfectly fits the bill.
Kovac played at Munich from 2001 to 2003 and in the Bundesliga for almost the whole of his career. He has some credible coaching experience, having managed the Croatian national team and currently leading Bundesliga side, Eintracht Frankfurt, who are doing extremely well under his tutelage.
Being a former player, the Bayern board would look at his candidature favorably and with recent results supporting his cause, he could be in with a shout at the end of the season.