Betsch started his career in the reserve team at Metz and made a total of 54 appearances in the Championnat de France amateur between 2006 and 2008, scoring twice.
[3] Betsch was again a regular starter during the first half of his second season with Créteil, but he then spent some time out of the side due to injury before returning for the game against Cannes on 24 April 2010.
[5] However, eight days later he ruptured ligaments in his left knee during a pre-season friendly match against German club Koblenz, an injury which required an operation and ruled him out for around six months.
[6] Betsch eventually made his Strasbourg debut on 25 February 2011, playing the first half of the 1–1 draw away at Gap before being substituted for Loïc Damour.
[7] He played his first senior match for the club on 26 August 2011, almost five years after making his debut for the reserves, coming on as a late replacement for Mahamane Traoré in the 1–1 draw away at Sedan.