During his first season at Derby County, Elšnik initially played for the under-18 team before progressing to the under-21 squad. At the end of the 2015–16 season, he was named the club's Scholar of the Year.[5] Shortly after signing a new three-year contract with the club in August 2016,[6] he made his first team debut as a substitute against Carlisle United in the EFL Cup, scoring twice in Derby's penalty shoot-out win.[7] He was released by Derby in July 2019.[8]
Swindon Town (loan)
On 31 August 2017, Elšnik signed on a season long loan for Swindon Town along with Derby teammate Kellan Gordon.[9] Two days later, Elšnik made his Swindon debut during their 4–1 home defeat against Barnet, featuring for the entire 90 minutes.[10]
Mansfield Town (loan)
On 31 August 2018, Elšnik signed on a season-long loan for Mansfield Town.[11] Four days later, Elšnik made his Mansfield debut during their 2–1 away win against Lincoln City in the EFL Trophy, featuring for the entire 90 minutes.[12]
On 30 October 2018, Elšnik was brought back into the Mansfield side, starting the game against Crewe Alexandra. Elsnik scored two goals ensuring a 3–0 win for Mansfield.[13]