Lundell won a gold medal with the Finland national under-18 team at the 2018 IIHF World U18 Championships, putting up six points in seven games. He won a gold medal with the Finland junior national team at the 2019 World Junior Ice Hockey Championships, producing four points in seven games. After missing the 2020 World Juniors due to injury, Lundell returned for the 2021 World Juniors where he captained Finland to the Bronze Medal. He recorded six goals and ten points in seven games, ranking as one of the tournament's top three leading scorers.