Birmingham manager Wayne Rooney admitted he could have replaced his whole team at half-time after a 3-1 Championship defeat to Stoke at St Andrew's.
First-half goals from Jordan Thompson and Lynden Gooch put Stoke 2-0 ahead and Andre Vidigal made it three before Jay Stansfield's 69th-minute consolation as Stoke ended a nine-match winless run and moved above Blues on goal difference.
Rooney has taken just nine points out of 39 since taking over, to leave Blues 19th in the table, just seven points clear of the relegation zone.
Rooney has suffered eight defeats and home fans began streaming out after Stoke's third goal, while those that were left jeered the team off at the end.
“Ideally, you wish you could have 11 subs as I could have changed all 11 players at half-time,” said Rooney.
“We just weren't doing the right things – the basics. It wasn't lack of effort, that would be unfair to say. It was lack of game knowledge.
“It's hard to put into words. I didn't see that performance coming. I didn't recognise the team out there on the pitch.
“It's frustrating because over the last few games we'd made some real strides, so this was difficult to take.
“It wasn't the result, or the performance, or anything we wanted to be honest. It was unrecognisable in the way we played.
“I felt the players didn't want to take the ball, they didn't press the way we wanted them to.
“The goals we conceded were crazy and we didn't deserve anything out of the game.”
Stoke led in the 12th minute through Thompson's 25-yard drive – his first strike for three years – which took a slight deflection off Juninho Bacuna.
Potter captain Gooch doubled their lead on the half-hour after darting down the left in a lightning counter-attack and poking the ball through goalkeeper John Ruddy's legs.
The Potters made it 3-0 after 53 minutes when Vidigal beat Dion Sanderson before lifting the ball over Ruddy to send Birmingham fans heading for the exits.
The hosts pulled one back through Stansfield after goalkeeper Jack Bonham saved teenage substitute Romelle Donovan's effort.
New Stoke head coach Steven Schumacher maintained his unbeaten start, making it four points from his first two games in charge and admitted a back-to-basics approach was working for him.
“What we've tried to do with the lads is just set some pretty basic, simple ground rules,” he said.
“These are about how we're going to try to behave at the training ground and what we expect, what are the non-negotiables and how we're going to try to play, with and without the ball.
“We showed some bits of quality so that was really pleasing and we managed to do enough to get the three points that we desperately wanted and needed.
“When you come into a job, you're desperate just to get the first win and we've done that now.”
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