Hjelde is the son of former Nottingham Forest and Rosenborg defender Jon Olav Hjelde, who was playing for South Korean K League club Busan I'cons when Leo was born in England.[4] Jon Olav briefly returned to England to witness Leo's birth, after which the family moved to South Korea for several months to live with Jon Olav in Busan. They returned to England in mid-2004, and subsequently moved to Norway after Jon Olav's two-year spell at Mansfield Town ended in 2007.[5]
Club career
Celtic
On 29 July 2019, Hjelde signed a professional contract with Scottish Premiership club Celtic at 15 years old; he was brought straight into the reserve squad.[6][7]
On 22 January 2021, Hjelde signed for Premiership side Ross County on loan for the remainder of the season.[8] He made his league debut the following day against Rangers in a 5–0 defeat.[9] He scored his first professional goal on 6 March 2021 in a 3–2 win against Kilmarnock.[10] His performances on loan led to Ross County boss John Hughes likening the young defender to former Celtic player Virgil van Dijk.[11]
Leeds United
On 27 August 2021, Hjelde signed for Leeds United for an undisclosed fee, signing a four-year deal at Elland Road.
Hjelde made his senior debut for Leeds United on 9 January 2022 in the starting line-up in 2–0 FA Cup third round defeat to West Ham United.[12] He made his Premier League debut the following week, also at West Ham, when he came on as a first-half replacement for Junior Firpo in Leeds' 3–2 win, becoming the youngest Norwegian to play in the Premier League.[13][14][4]