Going into the summer transfer window, it was quite clear that Celtic needed to sign a quality goalkeeper. Kasper Schmeichel, who had been the club's first-choice between the posts up until a serious injury, had retired in the summer.

Viljami Sinisalo was the new number one but there were question marks over his ability to hold on to that position.

It would have made sense for Celtic to go out and sign someone capable of competing for that first-team spot with Sinisalo. And all summer long, they were linked with several interesting options who seemed capable of that.

Eventually, though, Celtic did not sign any of them. Instead, they ended up bringing in 33-year-old English goalkeeper Sam Johnstone on loan from Wolves. So far, he has not been able to get ahead of Sinisalo in the pecking order.

The issue is that Sinisalo himself has faced his struggles this season. So, Celtic could do with another starting-level goalkeeper. That should give Martin O'Neill something to think about going into the winter transfer window.

It appears they might be going back for one of their rumoured transfer targets from the summer window, who might already be setting himself up for a move.

Balazs Toth of Blackburn Rovers is someone Celtic were linked with quite heavily in the summer transfer window although a move did not end up happening.

Now, as reported by Alan Nixon (via The Herald), Toth is not currently open to signing on an extension with Blackburn Rovers despite his deal expiring next summer.

Obviously, if that remains the case, it opens up two opportunities for Celtic. Firstly, they can sign him on a pre-contract deal in January, with him making the move to Parkhead next summer.

Secondly, they can just close the matter by signing him permanently in the January window itself for what would most likely be a bargain transfer fee.

If Sinisalo continues to struggle in goal, the second option should be given serious consideration, that is for sure.

It remains to be seen if Celtic do end up making a move for Toth this summer or not. On paper, it is hard to see why the Hoops continue to chase his signature.

He has outperformed his xGOT faced by 0.75 goals and has not made an error leading to goal so far this season in the Championship. Other than that though, there has not been anything outstanding out Toth's game.

His passing and distribution numbers are below average when compared to other Championship goalkeepers. And Toth is average when it comes to his shot stopping as well.

So, if Celtic do end up signing Toth, it would be interesting to see if he proves to be a success story at Parkhead or not.