Freshly crowned Bundesliga champions Bayer Leverkusen returned to training on Tuesday as they continue their bid for a title treble in the Europa League at West Ham United. Leverkusen take a 2-0 lead into Thursday’s quarter-final second leg match at London Stadium, and want to continue their unbeaten run all season which now stands at 43 games. The team will not leave for London until after a final training session at home on Wednesday morning. Coach Xabi Alonso has all players apart from injured Adam Hlozek on board. Leverkusen clinched a first ever German league title with five games to spar…