[4] On 29 November 2014, he made his first team debut in a Bundesliga game against SC Paderborn replacing Levent Ayçiçek after 83 minutes in a 4–0 home win.

[6] In the following 2015–2016 season, he made his full debut featuring in the number 10 role as Werder played Hertha Berlin on 22 August 2015.

On 18 August 2018, Eggestein scored his first goal of the 2018–19 season, in a 6–1 win against Wormatia Worms in the first round of the DFB-Pokal.

[10][11] Eggestein moved to SC Freiburg in August 2021, following Werder Bremen's relegation from the Bundesliga and after ten years with the club.

[13] This biographical article related to association football in Germany, about a midfielder born in the 1990s, is a stub.