[8] In July 2015 it was announced that Queens Park Rangers had signed Polter from FSV Mainz 05 on a three-year deal for an undisclosed fee.

Polter made an instant impact on his debut scoring QPR's third goal in their 10–0 win over Italian side Verona Stars in the club's first pre-season fixture of the summer.

Polter's league debut came in a 2–0 away loss to London rivals Charlton Athletic as he came on as a sub for Charlie Austin in the 84th minute.

[9] His full debut came in a League Cup match against Yeovil Town, he scored the first goal for QPR as they secured a comfortable 3–0 victory.

[13] He had, as the sole member of the first team, refused to take a pay cut as the club was struggling financially due to the effects of the pandemic.

[14] Polter signed a two-year contract with Dutch Eredivisie club Fortuna Sittard on 17 August 2020.

[21] Polter was a member of several German youth national teams and also appointed to the squad for 2013 UEFA European Under-21 Championship in Israel where Germany were eliminated at the group stage.