By ESPNSTAR.com staff
Bayern have enjoyed a great start to their Bundesliga season, currently topping the table on 31 points in 12 games, and the Bavarian giants hold a commanding eight point lead over their nearest challengers Schalke.
However, Die Roten's season suffered a blip after they were held to a 1-1 draw by lowly Nurnberg last weekend before being held to a draw of the same scoreline by 10-man Valencia in their midweek Champions League game.
Heynckes has pinpointed a lack of a fighting mentality within his squad as the main reason for their recent slump in form and has urged his charges to step up their game or risk being upset by a dangerous Hannover side.
"[We have to play] more aggressive again, play wider and quickly switch to a high tempo," Heynckes was quoted as saying by the official Bayern website.
"[Hannover] will require everything from us, they'll push us all the way.
"They may have had two days less to rest after playing on Thursday [in the Europa League] but it's only a minor disadvantage.
"In today's elite athletes, it makes no difference whatsoever."
Midfielder Bastian Schweinsteiger echoed his manager's sentiments and claimed that winning three points in their clash against Hannover would be the main priority.
"You don't just turn up and beat them [Hannover]," Schweinsteiger said.
"I'll be the happiest man on earth if we've simply taken three points by Saturday evening."
Heynckes will be without midfield lynchpin Luis Gustavo for this game after the Brazilian underwent surgery for a groin injury but the 67-year-old tactician should be able to call upon the services of winger Frank Ribery who has recovered from a bruised rib.