Melbourne have denied claims Heritier Lumumba is considering legal action against the club as he weighs up his AFL future.Lumumba looks certain to have played his final game for Melbourne and is likely to retire amid a dispute over the Demons handling of his concussion.The 2010 All-Australian defender claims Melbourne stopped him playing this season when he felt he had recovered from his concussion problems.Lumumba, who has just finished the second year of a three-year deal with Melbourne, concussed himself in round six and went on to suffer another knock to the head in his comeback game several weeks later in the VFL.The 30-year-old claims his lack of opportunities this season - playing just five games in total - meant he could not use a trigger clause in his contract for a fourth year.But Melbourne on Thursday were confident Lumumba would not pursue legal action.Heritier and the club are currently investigating issues associated with Heritiers health, to determine his ongoing playing future with the club, Demons football manager Josh Mahoney said.Contrary to media reports, Heritier has not threatened legal action against the club.We ask media to refrain from further speculation on Heritiers health while he seeks the necessary information to make an informed decision on his playing career.Lumumba, a premiership player with Collingwood in 2010, has sought further medical advice and has been in contact with the AFL Players Association as he considers his next move.The Demons are adamant they had handled the situation appropriately, and defender Bernie Vince on Thursday questioned whether Lumumba would have earned another game even if he had been cleared to play.Its real messy - how do you prove that he didnt play because of his head or he wasnt selected? Vince told Nova 100 radio.The doctors take a more precautionary side of things with head knocks and they leave you out for an extra week or an extra couple of weeks just to be careful, so for him to say they didnt treat it right was a bit disappointing.We think that weve got the best medicos in the comp. Theyre very cautious on that issue.I dont know the full ins and outs and Im not sure if hes retiring or not. It looks like he is.Demons coach Simon Goodwin earlier this month said Lumumba had been cleared of his symptoms and was poised to return to training.One of the AFLs most-enigmatic characters, Lumumba has played 223 senior games - 199 for the Magpies and 24 at Melbourne.AFL chief Gillon McLachlan on Thursday said he was comfortable with existing concussion protocols, adding that the league was investing significant money in concussion research. 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Nicola Adams and Laura Trott are among an additional four British athletes whose medical records with the World Anti-Doping Agency have been leaked by computer hackers.The multiple Olympic gold medallists are joined by swimmer Siobhan-Marie OConnor and rower Olivia Carnegie-Brown in the third batch of documents published on the website of cyber espionage group Fancy Bears, which is believed to be from Russia.There is no suggestion of any wrongdoing by any of the athletes.A fourth prohibited substance appears on Adams WADA record in the form of methylprednisolone, an anti-inflammatory used to treat arthritis and bronchitis for which she was given retrospective approval for its one-time emergency use.Cyclist Trott also had TUEs for salmeterol and salbutamol that expired on July 31, 2013.OConnor, who won Olympic silver in the 200m individual medley in Rio last month, has been granted use of prednisolone for five successive years, most recently in June.Prednisolone - a steroid that can be used for chest complaints - and salbutamol also appear on the medical record of Carnegie-Brown, a silver medal winner in the womens eight at the Rio Olympics.TUEs can be issued to athletes who have an illness or condition which requires the use of medication that is on WADAs prohibited list.Cyclists Sir Bradley Wiggins and Chris Froome were ammong five Britons who had documents leaked by the hackers on Thursday morning, with golfer Charley Hull, rower Sam Townsend and rugby sevens player Heather Fisher completing that list.ddddddddddddRio gold medallist Wiggins, who has never made any secret of the fact he suffers from asthma, was shown to have had several TUEs for salbutamol, while three-time Tour de France winner Froome had TUEs for prednisolone.American tennis stars Serena and Venus Williams and four-time Olympic gymnastics gold medallist Simone Biles were among those whose information was revealed earlier this week.Trott was born a month prematurely suffering from a collapsed lung and took up cycling after her parents had been told that as an asthmatic she would need to take part in sport to help regulate her breathing.A spokesman for Trott condemned the leak of information that should have remained private, but insists she has nothing to hide.Its well known that Laura has suffered from asthma from an early age and inhalers are part of most asthmatics lives, the spokesman told Press Association Sport.Its disappointing that her medical records have been put on the internet but asthma is something shes always been happy to discuss. 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