Brisbane: South Africa batsman JP Duminy is remaining positive after the âfreakish" injury that ruled him out of the Test series against Australia and could sideline him from all cricket for six months.Duminy ruptured his left Achilles tendon during a warm-down session following the opening day's play of the first Test at the Gabba on Friday. He had an operation to reattach the tendon this weekend but faces a lengthy recovery period of between four and six months."I'm still quite young, I still have a long career ahead of me," Duminy said on Monday. "I'm quite positive about these types of things, over the next four to six months it's about me putting in the hard work again and making sure I come back to full strength."The 28-year-old batsman said he hurt himself changing direction during training runs on the pitch. He initially thought he had been hit by a ball before realizing the extent of the injury."It was a bit freakish," Duminy said. "Initially I thought the ball hit me at the back of the foot or somebody slapped me because I heard a clicking sound, but when I turned around and saw that there was nobody behind me I knew that something was wrong."Duminy, who has established himself as an important part of the top-ranked Proteas Test team, is also set to miss home series against New Zealand and Pakistan early next year.He was due to return home soon but was tweeting from his hospital bed in Brisbane before and after his surgery on Saturday, thanking teammates and fans for their messages and support."Night spent in hospital and been taken well care of, gonna b watching the game from my room today!" Duminy wrote on Twitter as he followed the remainder of the opening Test.