The Bayern headquarters are very optimistic, they are confident that they will be able to reach the next round of the Champions League playoffs. There are injured players, but the main ones are probably Gnabry and Coman, otherwise everything is fine. If Tuchel doesn’t start changing something in the usual lineup model again, then Bayern shouldn’t have any problems.
Normally, every team is usually strong at their own playground and Bayern Munich is not excluded for the list too but the recent development in Bayern's squad is not a good sign to guarantee their winning in Allianz Arena. Remember Werder Bremen smashed them in their home just last month and Lazio is strong more than Werder Bremen.
Bayern has a top striker at the moment with one of the best goal keeper too and high level individual players. These actually mean they have higher chances to bounce back in the second leg but it all depends on Tuchel decision to make use of the right players in various positions. By the way, Lazio defense is not a joke, they have one of the strongest defense and this is very obvious if you check their goals conceded ratio. I won't be surprised if they come prepared to defend from first minute of the game till the end just to guard the one goal lead.