But there was no mistaking McCall's frustration ahead of the quarter-final clash at Fir Park on Wednesday night.
The Steelmen have only had one spot-kick this season which Bob McHugh missed against Russian side Kuban Krasnodar in the second leg of their Europa League qualifying tie.
McCall and others at the Lanarkshire club believe they have been denied at least four or five good penalty claims in the Scottish Premiership, the most recent of which was in the 2-0 defeat by St Johnstone at McDiarmid Park on Sunday when referee Calum Murray took no action when midfielder Paul Lawson's shot appeared to strike the hand of Saints' Gary McDonald.
McCall said: "Tomorrow's game can go to 120 minutes and possibly it can go to penalties.
"But I am still waiting for a ruling from the SPFL because we don't get penalties as you know and we might just go to a toss a coin.
"But because it is cup game, rules might change and so we practised penalties today.
"We have had one penalty kick this season - in Russia. They play the rules that if it hits your hand it is a penalty but unfortunately Bob missed it.
"But we have been practising them this morning and it might have made my mind up on who is on the bench because a few slotted them away nicely and a few blazed them over the bar.
"It is a bit tongue in cheek. Refereeing is a tough job, there is no doubt about that.
"But there has certainly been times this season when we merited penalty kicks and didn't get them."
Motherwell goalkeeper Lee Hollis remains on the sidelines with an ankle injury but McCall claims he was always going to keep number two Gunnar Nielsen in goals even though his horror mistake cost Well a goal in the 2-0 defeat against St Johnstone.
The former Everton, Rangers and Scotland midfielder said: "I was always going to play Gunnar in the cup anyway.
"He played at Livingston (in previous round) and I always had him down to play in this game.
"It was one of those things. He came in to the dressing and held his hands up. I just think it was a freak thing and it cost us a goal.
"There was no blame on him, we didn't merit anything from the game and there is certainly no finger pointing from me, the staff or anyone else."
Skipper Keith Lasley remains hopeful of a career-defining cup triumph before he hangs up his boots.
Despite their impressive league form in recent years, the Steelmen have not won silverware since their Scottish Cup triumph in 1991.
The 34-year-old midfielder remains inspired and hopeful after seeing Kilmarnock and St Mirren lift the trophy in recent years.
He said: "Certainly for me, you watch those games [previous finals] and you want it to be you.
"Cup wins can be what defines your career as a player. Hopefully I've still got a few shots left but these are certainly the competitions you hope one day you will be there.
"We've had a taste of cup finals in the past and it has not really worked out for us on the day.
"But even just getting there, the occasion is great and you look back on things at the end of your career and think that's a real highlight.
"It [winning] would be career defining. There's nobody more hungry than me to go out there and do that. You sit and you watch the likes of St Mirren and Kilmarnock doing it in recent years and you want to be that team, walking up the stairs and lifting the cup.
"We know we are still a long way from that but you have to have dream that it could be you."