Angry MK Dons boss Karl Robinson has threatened to wield the axe on his under-performing players after their shock 4-2 home defeat to Walsall.
Will Grigg's brace plus goals from Febian Brandy and Jamie Paterson handed the Saddlers an npower League One double over the below-par Dons, for whom Ryan Lowe and Dean Bowditch were both on target.
"It was shambolic defending from us - the defending in that first half was as bad as I've seen in two years of being here. We backed off, let them turn and shoot in our box and walk past us - it was kamakaze stuff really," Robinson said.
"I don't accept it and I won't accept it either. That back four won't play together on Saturday anyway. There were players out there who didn't deserve to wear our shirt - it's as simple as that - and they won't if they continue like that.
"I feel I've got to do my job over the next few weeks and there's certain players who have got to stand up and be counted. If they can't stand up and be counted against Coventry then I'll make changes in January."
Walsall manager Dean Smith was pleased to have come out with all three points against their much-fancied opponents.
He said: "It was a very good performance, a very good win, there were some very good bits of play, some very good goals. We started sloppily for their goal, I thought we should have done better for that, but we recovered and I can't ask any more of them. Maybe I should give them Christmas Day off every year.
"I thought tactically we were spot on. We knew they'd have a lot of possession, but we had a plan in terms of when we turned the ball over and it worked.
"It gives everyone a big boost, to go toe-to-toe with a team who are at the top and likely contenders to be up there challenging at the end of the season.
"We spoke about a few things at half-time, about where we could do better, and we certainly did that at half-time and restricted them to a few chances. It was really pleasing and we're just pleased we got the win and we can build on it now."