As a junior, he won the national championship title, before Preidler began his professional career in 2010 at the Austrian Continental team RC Arbö–Gourmetfein–Wels.

[5] In February 2019, Austrian newspaper Kronen Zeitung broke news that a number of professional cyclists had been implicated in the doping scandal uncovered at the FIS Nordic World Ski Championships 2019.

On 3 March, Preidler confessed to Austrian police, whilst also terminating his contract with Groupama–FDJ via email.

Preidler was due to race during the previous weekend, later admitting to having his blood drawn on two occasions late in 2018.

The team then contacted the Union Cycliste Internationale (UCI), the French Anti-Doping Agency (French: Agence française de lutte contre le dopage) and the Mouvement pour un cyclisme crédible (MPCC; English: Movement for Credible Cycling).