Calcutta, July 27 : Calcutta, July 27: Twenty-four hours after his epic 281 at the Eden Gardens found a place in Wisden's top-10 greatest Test innings, V.V.S.Laxman has learnt he needs to undergo "minor surgery" on his right knee. "It's a miniscule cartilage tear, but the surgery will put Laxman out for four weeks," team physio Andrew Leipus told The Telegraph, when contacted at the Taj Samudra in Colombo this evening. Laxman, who returns home right after tomorrow's tri-series game, will probably head for Australia -- his preferred choice for the surgery. What it also means is that he will miss the three-Test series, in Sri Lanka. Sachin Tendulkar is already injured, and it's debatable whether he will be fit from the first Test (August 14 onwards) itself. Out for long has been Anil Kumble. Meanwhile, there's also a bit of a problem with quick Zaheer Khan. "It's not serious but, purely as a precaution, I've advised him to go to Chennai for a day (again, immediately after the match tomorrow) and undergo a scan on the right shin," Leipus informed. The overworked physio added: "Should something show up in the scan, Zaheer will require a few days rest. That's all." It shouldn't surprise if captain Sourav Ganguly has already turned more grey.