Harry Kane has had a big influence on the overall performance of Tuchel squad this season, since being brought in last summer, his presence in Bayern Munich front line can give them an easy win. It is very natural that if Harry Kane is injured, fans will feel worried, it could be difficult for Bayern Munich to win in important matches, such as facing Dormund and Arsenal in the future. Tuchel certainly needs Harry Kane more in the Champions League match, he is very experienced in stopping Arsenal, who are currently slightly favourites.
There was an opinion that Premier League players find it hard to adapt to other leagues' clubs, but that didn't seem to be the case for Kane. No doubt that he's Bayern's key player, with 31 goals and 7 assists.
The other Bayern's top scorers are: Musiala [10], Sané [8] and Tel [5]. So all three combined have only 23 goals, not even close to Kane's 31 goals.
Can Bayern win without Kane? Sure, but he's absence would be a big blow and would make it much harder.
During this season in Bundesliga Tuchel was so often using the formation 4-2-3-1 with Sane and Musiala as the winger and Muller as attacking midfielder and Kane usually was played as centre striker although Bayern Munich performance is not stable this season but this formation was successfully to make Bayern Munich as the team with the most goals in Bundesliga with 78 goals from 26 matches and Kane has important contribution with 31 goals which mean almost a half from Bayern Munich total goals during this season is came from Harry Kane so these statistics is proven Harry Kane is very important player for Bayern Munich
Moreover Tuchel is too rely on Harry Kane in Bundesliga because Harry Kane was never absense during this season and this is not good for Bayern Munich conditions because they are pushing Kane too hard to play in almost every matches and indeed the match against Dortmund hasn't started yet so everything still possible to happend but losing Kane is big lost for Bayern Munich and Choupo-Moting probably can be played as the replacement of Kane but i am not sure he can able to performing well or not because Choupo-Moting goals records is very poor and the latest news from Bayern Munich squad is besides Kane reported Manuel Neuer has uncertain condition but they still have Sven Ulreich to played