South Africa paceman Dale Steyn will miss the second Test against England in Cape Town.
The Proteas were soundly beaten in the first Test in Durban on Wednesday and have already had to call up paceman Hardus Viljoen as cover for Kyle Abbott, who is struggling with a hamstring injury.
"Dale will miss the next Test, and Kyle is pending a fitness test to see if he's good to go," Amla said.
"Without Dale, Kagiso Rabada will come in. If Kyle is not fit we have to make a decision between Hardus Viljoen and Chris Morris, those are our two options."
"Quinton being here gives us the option of him keeping and batting at six or seven but we still have to make a call on whose position he takes," said Amla.
"It gives us the option of getting Quinny in and taking a load off AB."
Meanwhile, South Africa have sent an SOS to former skipper Graeme Smith ahead of the second Test tomorrow.
The Proteas' defeat in Durban was the latest in a string of disappointing performances and results for the world's number one side.
Smith was present at nets in Cape Town today, working alongside the team's misfiring batsmen having been approached by Cricket South Africa.
His successor as captain, Amla, was delighted to see Smith, who has been working as a commentator for SuperSport and BBC Test Match Special, helping out.
“Graeme has a lot of value to add and hopefully we will tap into that,” Amla said.
"We've asked Graeme to join us for a little while because being the excellent cricketer he was there is certainly some value he can add to the batters.
"Graeme has been a wonderful cricketer for South Africa and a wonderful captain. He knows more than most how it is to play Test cricket and go through tough times.
"I won't say Graeme was the most technically correct batter himself, but he's got good know how about Test cricket and that's what it's about, having a feel for the game."