Celtic manager Neil Lennon was left 'raging' after his side's 1-0 home defeat to St Johnstone.
The home side squandered a number of opportunities in front of goal, including a missed penalty by Kris Commons.
"We were wasteful and when you're wasteful, poor in front of goal and sloppy, you will get turned over," Lennon said.
"A penalty is a gift and we keep missing them; it is not good enough."
"I'm raging, absolutely raging and I've told the players that," he added.
Lennon, who made over 200 appearances for the Glasgow club, also questioned his players' commitment to the cause.
"I don't know where some people's heads are, if they want to be here or not."
The result leaves the Bhoys third in the SPL table, one point behind Motherwell and Rangers.
