Born in Creglingen, Baden-Württemberg, Speidel began his career as a conditioning coach at Fortuna Köln and 1.
Benfica of the Portuguese Primeira Liga, managed by compatriot Jupp Heynckes; he signed a one-year deal to work at all levels of the club, especially the youth and B-team.
[2] In 2001, Speidel moved across the border to work at Xerez CD in the Spanish Segunda División under German manager Bernd Schuster.
[8] Speidel returned to conditioning coaching at Bayern Munich II and was assistant manager at Energie Cottbus and Arminia Bielefeld.
In February 2017, incoming VfL Wolfsburg manager Andries Jonker named him and Freddie Ljungberg as assistants.