In my opinion, even though Erik Ten Hag wanted the Bayer Leverkusen key players that left the club in the summer transfer window to remaining at Bayer Leverkusen this season that wouldn't have happened because it seems it was the Idea of Bayer Leverkusen management to cash in on those players. With the attitude Bayer Leverkusen showed in the two matches they played this season, they might likely not make it to the top four.
Leverkusen are in a precarious situation at the start of the season, so it's a bit difficult for them to do well this season. I'm still not sure what they'll do now that Ten Hag has been sacked and whether they'll hire a new coach or not. The impact of such a precarious situation will definitely be felt on the pitch and I expect it to be negative.
Since Bayer Leverkusen management relieved Erik Ten Hag of his job as Bayer Leverkusen head coach, they are yet to hire a new coach as Erik Ten Hag's replacement. I believe Bayer Leverkusen will have no choice but to play with an interim coach for the time being. Bayer Leverkusen has put themselves in a difficult situation this season, and they will pay for it dearly by struggling to win their matches this season.
Wow, I just found out that Erik Ten Hag was fired. I think I missed this information. I didn't expect Leverkusen to make such a quick decision to fire this coach, even though Ten Hag has only played two Bundesliga matches and hasn't won yet. I thought they would give him at least until the middle of the season to see results, but Leverkusen doesn't have the patience of Manchester United, and in my opinion, this is better than Leverkusen sinking further, because Ten Hag is completely unreliable.
For now, it seems Leverkusen will truly choose a qualified coach and won't rush into making a decision.