“I thought coming into this camp, Pocognoli would probably need a period of grace,” Halliday said on Sportsound. “I think that period of grace is now over.
“That was as poor a Scotland performance as I can remember for a while against an opposition you are expecting us to go and beat.”
Slovenia got in behind Scotland’s high defensive line repeatedly and former national team captain Willie Miller is unsure if Pocognoli will stick with his back three.
“This is Pocognoli’s preferred system and he’s had time to work with the system, it was just all over the place,” Miller said on Sportsound.
“Time and time again there were huge gaps appearing and Slovenia were taking advantage.
“Our situation is we’ve got a new manager in, he’s got a preferred system, what does he do? Does he just bin it? Are we back to a back four?
“His preferred system is a back three, but it was unbelievably poor.”