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Ilia Iliev Gruev (Bulgarian: Илия Илиев Груев; born 6 May 2000) is a Bulgarian professional footballer who plays as a defensive midfielder for EFL Championship club Leeds United and the Bulgaria national team. Gruev made his professional debut for Werder Bremen in the second round of the 2020–21 DFB-Pokal on 23 December 2020, coming on as a substitute in the 87th minute for Jean-Manuel Mbom against Hannover 96. The away match finished as a 3–0 win for Bremen. On 31 August 2023, Gruev signed for EFL Championship club Leeds United on a four-year deal for an undisclosed fee. Gruev has appeared for the Bulgaria under-17, under-18, under-19 and under-21 national teams. He received his first call-up for the senior national team on 5 September 2022, for the games of the UEFA Nations League games against Gibraltar and North Macedonia on 23 and 26 September 2022. He made his debut in the match against Gibraltar on 23 September, won 5–1 by Bulgaria. Gruev was born in Sofia, but also holds German citizenship. He is the son of Iliya Gruev, former footballer and current manager.