Luxembourg's anti-doping authorities suspended cyclist Frank Schleck until July 14 after he tested positive for a banned substance during last year's Tour de France.The 32-year-old Schleck was given a 12-month suspension backdated to last year's Tour, where he tested positive for the diuretic Xipamide. He has denied any wrongdoing. Frank Schleck placed third in the 2011 Tour de France. He will miss this year's Tour under the current suspension.