Steyn expects to miss six months

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South Africa star Dale Steyn expects to undergo surgery on his injured shoulder and miss at least six months.

The paceman aggravated the injury during day two of the first Test against Australia in Perth on Friday.

Steyn, 33, said it was a similar injury to the one he suffered against England late last year, but likely worse.

"I did something very similar against England in December in a similar area, but it wasn't as bad," he told Channel Nine.

"That was a stress reaction which is like a very hairline, small little crack, but this time it's more of a fracture so it's kind of broken the whole bone.

"I'll probably look to have surgery and have to put a plate in there and get the bone kind of back together or something like that.

"We're probably looking at a minimum of six months before I'm going up again."

Steyn described the moment he felt the injury, as he pulled up during his 13th over of the game.

He said: "I was bowling yesterday and I felt this pop, or like a thud, in my shoulder and a lot of pain.

"I had to go off the field, went for an MRI and we've got a clean fracture in one of my bones inside my shoulder. It's not pretty."

The injury is a huge blow to Steyn and South Africa, who recovered to take control of the first Test.