Stuart McCall admits there will be a lot of soul searching at Fir Park before Motherwell can begin to atone for their shock William Hill Scottish Cup defeat by Albion Rovers when they host Celtic on Friday.

McCall described his team's possession play as "woeful" as they struggled to break down a disciplined Rovers side before Gary Phillips struck the only goal in the 90th minute.

Motherwell only seriously tested Rovers goalkeeper Neil Parry once, when John Sutton's powerful header from a 78th-minute corner was saved.

Motherwell had survived a couple of scares themselves, but McCall was shell-shocked by the late winner, which sparked an angry reaction from some Motherwell fans at New Douglas Park, although many applauded the League Two side off the park.

McCall said: "It's going to be a hell of a long week, but once the dust settles we have to look forward.

"We are doing okay in the league and we have got Celtic to come to us on Friday night. Between now and then there is going to be a lot of soul searching and analysis.But it wasn't down to a lack of preparation.

"We had Albion Rovers watched four times, I had seen a DVD, and we had profiles of all their players up on the wall before the game. We talked all week about approaching the game properly.

"I don't think we did approach it in a casual way or a negative way or 'thinking this is going to be easy' way.

"I just think the quality of our passing and crossing was probably the worst since I've been at the club. But I don't want to take anything away from Rovers. They defended manfully and gave their all.

"I said before the game they would match us for energy, aggression and desire and hopefully our quality would come through. It didn't. We didn't have the nous or intelligence."

The victory was the Coatbridge club's first against their Lanarkshire neighbours in 35 meetings between the teams in major competitions.

Delighted Rovers boss James Ward had told his players: "Don't have any regrets coming back in about what you might have done. Give us everything you have got."