"I'm on the crutches because I've got a no bearing weight on the leg for a while, at least two weeks, which makes it seem worse than it actually is," Steyn told 'Sony ESPN', the official broadcaster of the series.
"But it's right underneath the heel, so it's extremely sore to stand on or step on. And as you know, as fast bowlers we land on that front foot pretty often. So I'm going to have to give it time to recover - six weeks, and I'll be up and running again," he said.
Speaking of his injury, Steyn said he isn't too bogged down by it given that he has gone through worse in his career. The pacer said he is hoping to be fit for the home Test series against Australia in March-April.
"Yeah, that (getting ready for the Australia series) is the plan. Next two weeks, nothing on my feet. Stay off my feet. After that, I'll start walking around, and in about four weeks, I'll start running and then look to start practicing again in six weeks.
Steyn said a shoulder injury would have been a bigger blow to him.
"But this is a cricket injury, it's like a batter getting hit on the hand and breaking a finger. So I'm okay with that, just got to put it away and get on with the job," he said.