Sedlar has started his career as a midfielder, but affirmed himself as a centre-back playing with Metalac Gornji Milanovac.

Later, he was rotated on centre-back position, but he was not the first choice,[5] so he made only 3 league caps and one cup match for the autumn half of season.

He also played on some different positions as in the past, but all of 26 matches he started on the field and scored 2 goals, against Jedinstvo Putevi,[9] and Javor Ivanjica.

[17] Sedlar missed some matches in the first half season because of injury, but beginning of December, the media reported Red Star Belgrade has expressed interest in him.

[21] On 12 July 2019, Sedlar signed a four-year deal with La Liga side RCD Mallorca as a free agent.

[23] The coach of the Serbia national team, Slavoljub Muslin, called Sedlar into the squad for several friendly matches during the year 2016.