SOUTH China's Australian centre forward, Marko Perinovic, is under pressure to produce an impressive performance in the second leg of their Asian Cup Winners' Championship quarter-final tie against East Bengal at Mongkok Stadium tomorrow. The 29-year-old Canberra-born Croat, who has been struggling with a knee injury since the opening day of the season, has been warned that his future at the club is in doubt if he cannot regain full fitness and form. ''Basically it all depends on the next game against East Bengal,'' admitted Perinovic, who was signed by the Caroliners just before the start of the season after their former Feyenoord striker, Ed Roos, returned to Holland. ''The club do not believe my knee will be 100 per cent again so I have got to prove them wrong when I get out there against the Indians.'' Perinovic, formerly with Sydney Olympic in Australia, hurt his left knee in the opening league game of the season - against Eastern on September 19 - and did not return to the first team until November 9, when he played the last 15 minutes of a 2-0 win over Happy Valley. With Bosnian forward Anto Grabo ruled out of the first leg of the Bengal tie with a hamstring strain, Perinovic played the full 90 minutes of the Caroliners' 1-0 victory in Calcutta last Monday but was clearly struggling for mobility and match fitness. After returning to the territory on Wednesday, though, Perinovic grabbed a hat-trick in a friendly against Rangers the following day. East Bengal arrived in Hong Kong last night and will train at the South China Athletic Association stadium in Caroline Hill Road today. They can expect a new face in the South China line-up tomorrow - in-form striker Au Wai-lun, who was suspended for the first leg after being booked in both legs of the first-round 2-1 win over Dalian, of China. South China defender or midfielder Chan Ping-on has recovered from an ankle injury and is available, although he may lose his place to accommodate Au's return.