South Africa coach Allister Coetzee was heavily critical of his players after overseeing a 26-20 defeat to 14-man Ireland in his first match in charge.
Coetzee's reign as Springboks coach looked likely to begin positively when Ireland's CJ Stander was dismissed after just 23 minutes at Newlands on Saturday for a dangerous tackle on Pat Lambie.
However, Ireland made light of their numerical disadvantage to claim a famous win - their first in Tests on South African soil.
Coetzee, who confirmed Lambie had suffered concussion and will not be considered for next Saturday's second Test, made it clear he expects significant improvement from South Africa in Johannesburg.
"The performance was not good enough if you want to be called a Springbok," he said.
"Test match rugby is not Super Rugby. Discipline will cost you at this level.
"We conceded eight penalties in the first half, made too many little mistakes on attack. By losing ball in contact or on the ground, we could not get the momentum we needed.
"Lots of hard work awaits and we have to fix it, as simple as that."
Despite being unimpressed by his own team's efforts, Coetzee was gracious in showering praise on Ireland.
"They played outstandingly well, considering that they only competed with 14 men for so long. They deserved the win," added the Springboks coach.
Stander was sent off for clattering Lambie in the head with his right hip after the fly-half had put in a chip over the top of the Ireland defence.
Coetzee said: "The provisional diagnosis is that Pat was concussed and although he is ok, will not be considered for next weekend."