Highly experienced centre half, Erik Sula began his career in his hometown at FK Poprad, where he made 60 appearances and scored 3 goals. His impressive performances earned him a loan move to Partizán Bardejov, where he continued to showcase his defensive prowess, scoring 1 goal in 16 appearances. Šuľa’s career then saw him move internationally to Fotbal Třinec in the Czech National Football League, making 21 appearances between 2018 and 2019. He then returned to Slovakia, joining FC Nitra in the Fortuna Liga, the top-tier of Slovakian football. In August 2022, Šuľa signed with Clyde in Scottish League One. Over two seasons, he became a key player for Clyde, amassing 62 appearances, scoring two goals and gaining an assist too.