The Socceroos will nervously await news on Aiden O'Neill after the industrious midfield regular suffered an ankle injury less than six weeks out from the World Cup. After being stepped on, O'Neill went down twice, then came off the field just 36 minutes into New York City FC's 2-0 loss to DC United on Sunday, local time.The news will send waves through Socceroos camp, given O'Neill, looking to play in his first World Cup finals, has been coach Tony Popovic's first-choice defensive midfielder along with Jackson Irvine.More recently, the likes of Paul Okon Jnr and Max Balard have also paired up with O'Neill, 27, who has started Australia's past seven games and has 29 caps.The Socceroos will hope O'Neill's injury is on the less serious end of the scale, given the short lead-in to the World Cup, with Australia's first game on Sunday, June 14.O'Neill's NYCFC coach confirmed, much like Irvine, he had already been playing with an ankle problem."But he plays with some issues in his ankle all the time He tried for a couple minutes, and I know for a fact, that Aido is not a guy that just steps out unnecessarily."O'Neill's teammate Kai Trewin played a full game, as did fellow Aussie defender Kye Rowles for DC United.Popovic is due to speak to media on Monday afternoon in Sydney.The Socceroos have a training camp in Sarasota, then play a friendly against Mexico in Los Angeles on May 31 — the last game before Popovic selects his squad on June 1 — before relocating to their Bay Area base.Australia then play Switzerland on June 7 in San Diego, their final warm-up game.The Socceroos face Turkey in Vancouver on June 14, the United States in Seattle six days later, then Paraguay in Santa Clara on June 26 (all dates AEST).AAP