Looking at the German market Nagelsmann and Hoeneß look like the standout candidates, but they would only be available after the summer - if at all.
Then there's Glasner and Hasenhüttl, who have some experience and recent success (relatively speaking), but aren't really people Dortmund should employ long term.
Or they could go for "vibes" in by approaching Kuntz or Enrico Maaßen, who was successful with Dortmund's second team.
Then there's the desperate "all or nothing" category: try to approach Flick or Conte.
Or the Dutch baldie category: Some weirdo on the caf has been going on about Arne Slot for ages, or.. ..Peter Bosz (admittedly trying to appoint him for a second time would certainly raise eyebrows) - probably approachable next summer at the earliest?! Or ten Hag, but his football hasn't looked much better than Terzic's, has it?
They are hardly inspiring, but I think the Austrians look like the most realistic candidates, both in terms of availability and reliability. It's not like Dortmund can just sign some masterful tactician mid season.
I don't know about Kehl. His signings were:
- Haller
- Adeyemi
- Schlotterbeck
- Duranville
- Modeste
- Ryerson
- Özcan
- Süle
- Nmecha
- Sabitzer
- Füllkrug
- Bensebaini
I would categorize them the following way:
Positive:
- Ryerson - very solid at the back, knows his limitations in attack, can play on either side. For €5m I'd clone him in a heartbeat.
- Schlotterbeck - needs to develop more consistency, but still a good buy
- Süle - gets a lot of flak and could do more with his talent, but I think his biggest problem at the moment is that Hummels has come to life again
- Füllkrug - emergency signing, because of Haller's illness, wasn't exactly cheap, but he leads the team in goals and is second in assists
Negative:
- Modeste - desperate reaction to Haller's injury, I won't hold that against anyone
- Bensebaini - has been slow to get going, doesn't seemed a bad fit for Terzic
- Adeyemi - his profile is too close to Malen's, hasn't produced more than a few weeks of good form in 18 months, way too little impact for €30m
Neutral:
- Özcan - lacks the quality to start for Dortmund, but at €5m and reportedly fairly low wages he's a cost-efficient backup signing, whose highly motivated
- Sabitzer - some injury problems, neither great nor terrible. Judging by what he's done so far maybe a bit too expensive
Too injured/ill to judge:
Aside from Duranville there's no imaginative signing, they are all German and/or (former) Bundesliga players. That's definitely a problem. But in general I don't think that list mandates a sacking. I guess Nmecha is the swing vote. Maybe he's part of the problem, but 18 months is a very short time to assess a DoF without knowing what's been going on behind the scenes.