sentences:  Having expressed desire in continuing his career abroad, on July 14, 2017, Klein signed a one-year contract with the ZSC Lions of the National League (NL).He made his NL debut on September 8, 2017, against the SCL Tigers at the Ilfis Stadium and scored his first goal that same day, an OT game-winning goal.After being crowned Swiss champion in April 2018, Klein signed a one-year contract extension with the Lions on May 23, 2018.