Sam Johnstone is struggling to justify his place in Celtic’s starting XI, and his performance against Dundee United won’t have changed many minds.

Camilo Duran gave Celtic the lead at Parkhead, but Zachary Sapsford and Neil Farrugia scored twice in three minutes to turn the game around for Jim Goodwin’s side.

United’s second goal came from a set piece that Celtic failed to deal with inside their own penalty area.

And former Hoops goalkeeper Pat Bonner spotted something he wasn’t happy about.

Pat Bonner questions Sam Johnstone’s part in Dundee United goal

Speaking on BBC Sportsound, Bonner questioned Johnstone’s decision not to come for the delivery.

“I did say set pieces Celtic keep giving away that there’s a chance that the opposition can score.

“Probably Sam Johnstone might have been able to come and get a punch and it goes right into the six-yard box from quite a distance out.

“He didn’t come. Then there was hesitation.

“The ball dropped down, second phase, and they had two or three bodies there to put the ball in the back of the net.”

Bonner wasn’t certain Johnstone could have reached the ball, but the hesitation was obvious enough for him to mention it.

The defenders made a mess of it too. But Johnstone had an opportunity to attack the initial delivery, and Bonner clearly felt he could have done more.

Sam Johnstone hasn’t earned the right to keep Viljami Sinisalo out of Celtic’s team

Johnstone arrived at Celtic with plenty of Premier League experience and an England cap to his name. But what has he actually done to make himself the undisputed number one?

Against Celta Vigo last week, Celtic conceded twice in three minutes, first from a header following a free-kick and then from a shot outside the penalty area.

Johnstone got a hand to the first effort without keeping it out, and the second flew past him as Celtic surrendered their lead.

Now we’ve watched United score from another set piece, with Johnstone remaining on his line as the ball came into the six-yard box. It’s becoming difficult to understand why Viljami Sinisalo is still sitting on the bench.

The Finnish goalkeeper has made mistakes himself, but Johnstone was brought into the team to offer something better. We’re not seeing it often enough.

Celtic need a goalkeeper who commands his area, particularly when opposition teams are putting balls into the six-yard box.

Johnstone’s experience means little if he isn’t using it to make those decisions.

O’Neill has given him his opportunity. He hasn’t taken it.

Sinisalo deserves another chance.