Celtic have had their troubles in Europe this season, but on the domestic front, Martin O’Neill’s side are still leading the Premiership table.

After a scrappy win at Hibernian over the weekend, Celtic face Dundee United at Parkhead, aiming to maintain their four-point lead.

From Sam Johnstone to Kasper Hogh: The questions facing Martin O’Neill ahead of Celtic’s Dundee United clash

Does Sam Johnstone keep his place in Celtic’s XI?

Sam Johnstone started at Easter Road, with O’Neill saying it’s because of Celtic’s heavy fixture load rather than because the Englishman is now the club’s number one.

It’s not helpful that O’Neill is doing this because it just continues to put a cloud over the goalkeeping spot, so it’s right to question whether Johnstone or Viljami Sinisalo start on Wednesday night.

Will Martin O’Neill refresh his midfield?

For the last two matches – Celtic’s defeat to Celta Vigo in the Europa League, and then the three points against Hibernian- only one change has been made to the midfield.

That’s Mika Baur going off for the last ten minutes against Celta Vigo. Other than that, Callum McGregor, Benjamin Nygren and Baur have played most of the minutes.

With Alex Oxlade-Chamberlain in the wings, Joel van den Berg returning from injury, surely the midfield will be refreshed against Dundee United because the team has looked leggy in the second half of matches.

How will Celtic’s forward line shape up?

It might be obvious to many that Camilo Duran starts up top, but even though he continues to outperform the out-of-sorts Hogh, the Colombian still finds himself on the right.

Perhaps Duran starts on the right again, but Hogh is on the bench, and Chelsea loanee Shim Mheuka earns his first start.

On the one hand, Hogh needs dropping, but on the other hand, he is Celtic’s club-record transfer, and you can’t discard him completely.