Celtic have been very poor so far this season. A lot of fingers have been pointed towards the team, the coaching staff and the board. But at the same time, one cannot overlook the impact that bad luck has had on the Hoops.

There have been far too many injury problems already for any team to perform at their peak levels.

Celtic had been missing key players already. And coming out of the Kilmarnock game, another name might now have been added to that list, unfortunately.

Mika Baur appeared to pick up an injury in the game against Kilmarnock. And there was no real clarity about the extent of the issue after the match, although the player was set to undergo a scan.

Now, the extent of Baur's injury is still not known. It is quite clear though that it is not something that he will just shake off immediately.

That is because the DFB have officially announced that Baur is one of the players set to be unavailable during this international break.

Baur, who made his full international debut under Jurgen Klopp recently, was set to represent the Germany U21 team during this break but has had to pull out due to the ankle injury suffered against Kilmarnock.

Now, how long will the issue keep him out of action? Will he be back right after the international break and need just a short time off? Or will he be on the sidelines for a while? 

If it is the latter, that will be bad news for Celtic. Their midfield has already struggled this season and Baur has arguably been the club's best option in the middle of the park since his summer arrival.

Baur is one of the few Celtic players, alongside Camilo Duran, who has earned plaudits for his performances this season.

So, if Baur ends up having to spend time on the sidelines with an injury, however long that may be, it would be viewed as bad news for Celtic.

There are serious question marks about how this Celtic midfielder will look without Baur, who has been the engine for them in midfield.

Both Callum McGregor and Benjamin Nygren have been criticised for their displays so far this season. 

The club have Oliver Sorensen, Joel van den Berg, Alex Oxlade-Chamberlain and Luke McCowan as potential options who can take Baur's place in the starting XI. None of those names will fill the fans with confidence though.