Starting his career at lower tier clubs FV Löchgau and Sonnenhof Großaspach in Württemberg, Röcker moved to VfB Stuttgart in 2011, where he became a regular for the second team.

[1] Röcker made his debut for the first team of VfB Stuttgart on 6 December 2012 during the 2012–13 UEFA Europa League group stage against Molde FK.

[4] He won his maiden first team call-up for Fürth's league match at home versus Karlsruher SC on 14 February.

[10] However, in decisive games against eventual champions FC Midtjylland, as well as AC Horsens, Brøndby's lead in the table was lost and they finished in second place.

[11] They had more success in the Danish Cup, with Röcker scoring a crucial goal as Brøndby beat Silkeborg IF 3–1 in the final to claim the trophy.

[15][16] He made 21 total appearances during the season in which he scored one goal,[1] as Wehen Wiesbaden finished 17th in the league table and suffered relegation to the 3.

[17] Röcker was sidelined at the start of the new season due to patellar tendinitis in his right knee, and in November 2020 further examination showed that he had suffered cartilage damage which required surgery.