MADRID, Aug 12 (Reuters) - Spain’s top league soccer clubs on Thursday approved private equity firm CVC’s proposed investment in return for long-term access to a share of LaLiga’s revenues, provided that individual clubs can opt out of the deal, two sources said. In an attempt to win enough support for the 2.7 billion euro plan, CVC had modified its original proposal shortly before the vote, allowing clubs in LaLiga, which covers Spain’s top two soccer divisions, to take part on a voluntary basis. Despite the approval by 38 clubs out of LaLiga’s 42, the deal still faces legal risks after drawing fierce opposition from top clubs Real Madrid and FC Barcelona. (Reporting by Belen Carreno, Anna Valderrama and Inti Landauro, editing by Andrei Khalip)