Career
Fußball-Bundesliga. Early career
Sippel began his football career playing for his hometown club of SV 1911 Bad Dürkheim. While with Bad Dürkheim, he rose through the youth ranks culminating as the first goalkeeper for their 2005 entry in the Regionalliga Süd (tier four of the German football league system) at the age of 17. Kaiserslautern
In 2006, Bundesliga club 1.
Football Club Kaiserslautern signed him to his first professional contract.
Sippel spent one season playing with Kaiserslautern II in the Oberliga Südwest (then tier four of the German football league system). After one year, he joined the first team as the third keeper behind Jürgen Macho and Florian Fromlowitz.
The previous season had seen Kaiserslautern relegated from the Bundesliga to the 2. Bundesliga. He ascended to the second keeper behind U-21 national keeper Florian Fromlowitz when Jürgen Macho left Kaiserslautern to play for the Greek club AEK Athens.
Ten games into the 2007-2008 season, Fromlowitz was injured thrusting Sippel into the role of starting goalkeeper.
He helped Kaiserslautern avoid relegation to the 3rd Liga on the last day of the season with a clean sheet versus already promoted 1. Football Club Kölane He was placed on injured reserve until the beginning of 2009. Borussia Mönchengladbach
On 26 May 2015, Sippel joined Borussia Mönchengladbach on free transfer, signing three-year deal.