Miami - Major League Soccer said Thursday it will conduct a second phase of study into proposals to bring its season into line with the European calendar.MLS currently plays from February to December but has been examining a plan to switch to start the campaign at the end of the summer and conclude in the spring.'Major League Soccer's Board of Governors today authorized a second phase of exploration into a potential move to the international soccer calendar, along with a continued evaluation of the league's regular season and playoff formats,' the league said in a statement.