Knorr started playing handball in the Mini-Mix from VfL Bad Schwartau.

[2] In addition, he played football for VfL Bad Schwartau and VfB Lübeck until 2015.

He left VfL in 2017, at the age of 17, and joined HSG Ostsee N / G, which was trained by his father Thomas Knorr.

[4] In December 2018 he made his debut in FC Barcelona's top team, where he played a total of six games.

With Germany he participated in the European Men's U-18 Handball Championship in 2018, and was awarded a place in the All-Star team as the best left back.