It would be an understatement to say that things are not going according to plan for Celtic right now. Even when they win games, there are more questions than answers coming out of it. The recent 1-0 victory over Kilmarnock might be a great example of that.

Firstly, beating the bottom of the table team by merely a 1-0 scoreline at home is not the confidence-boosting result that the fans would have been hoping for.

Secondly, there are some fresh fitness issues that might have cropped up in that match. Mika Baur's ankle issue is one we have discussed already. But it might not be the only one worth keeping an eye on heading into the international break.

Celtic have enough injury problems as is and do not need any more. But there could be further bad news for Martin O'Neill. At least that is what recent events appear to be suggesting.

Colby Donovan has been ruled out of Scotland U21 duty. There is no proper explanation for that decision though.

Donovan played the entire game against Kilmarnock from start to finish. So, one can only wonder if or when he might have picked up a knock, if he indeed did.

Donovan is a very important player for Celtic at the moment, especially with Alistair Johnston going through yet another injury-riddled campaign.

At this point, Johnston is no longer someone Celtic can rely on. Even though the Canadian international is one of the club's best players, he is injured far too often to be considered a nailed-on starter.

Donovan has shown flashes that he has the potential to be a long-term starter for Celtic as well. But, the last thing they need is another right-back to get caught up in injury troubles.

Once again, it is unclear whether it was an injury that caused Donovan's exclusion. There might be another reason behind it.

But generally, injuries are the most common reason behind such last-minute pull-outs. So, Celtic fans will be worried and waiting on more updates on the situation.

Right now, there is not much else they can do. As for the team, it is quite clear that they will need to improve after the international break.

Yet, it is hard to imagine what the switch would be that could turn things around for this off-colour Celtic team.