Shiels' captain was among two players to lose appeals during a session that left St Johnstone boss Steve Lomas facing an eight-match ban. Shiels hit out after Rugby Park defender Manuel Pascali lost his appeal against his dismissal for a challenge on St Johnstone forward Nigel Hasselbaink. Motherwell goalkeeper Darren Randolph had earlier failed in his challenge against a two-match suspension as he was found guilty of violent conduct over his clash with Hearts striker Callum Paterson. And Lomas was later handed a six-match ban for an angry reaction towards referee Iain Brines over a decision during his side's draw at Celtic Park this month, with a suspended two-game punishment also invoked. Shiels, who was hit with two SFA charges earlier this week, told STV:
"The referee (Stevie O'Reilly) made a mistake. It was a blatant mistake. How they have come to this decision is quite unbelievable.
"We need answers. I want to see the report.
"I've lost a lot of faith in the system because the system isn't working."
Motherwell goalkeeping coach Gordon Marshall felt the panel failed to see Randolph's clash with Paterson from a goalkeeper's point of view. The Republic of Ireland international caught Paterson with his leg as he collected a high ball with referee Crawford Allan seeing nothing untoward at the time. Marshall told MFCTV:
"I think he is only protecting himself and with his momentum carrying him forward he can't get out the way.
"The two players collide but thankfully Callum Paterson has not been injured; probably more fright than anything else.
"Darren was 100 per cent committed to getting the ball. You have to be focused on the ball because if not there is a chance you will spill the ball.
"He jumps through the challenge and ends up hitting Callum Paterson and keeps the ball.
"I thought it was good positive goalkeeping."
Marshall, who has no fears about Lee Hollis replacing Randolph during Saturday's William Hill Scottish Cup clash at Aberdeen, added:
"We got a fair hearing but in the end unless you have been in the position it's very difficult to talk about it.
"He's got a great disciplinary record and I thought that could have been taken into account."
Lomas received his ban less than 24 hours after being sent to the stand during a 1-0 defeat by Hibernian, for what he said was kicking a water bottle in frustration at Hasselbaink's missed penalty. He could now face more punishment in the coming weeks after his suspended two-match ban for accusing Ross County midfielder Richard Brittain of cheating was added to the punishment for his sending-off against Celtic.