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Reliable full-back who can also operate in the centre of defence and enjoyed a fine season on a personal level.
After making five appearances, three as starter, during the 2014/15 Under-18 campaign, the Manchester-born defender earned the right to be considered a regular in the team. Warren actually made his debut as an Under-15 schoolboy back in 2013/14 and started the 3-2 defeat at Sunderland but he has matured nicely. An outstanding display against Wolfsburg at Leigh Sports Village in the opening home fixture of the UEFA Youth League in 2015 earned praise from coach Nicky Butt, who described him as the "best player on the pitch" during a post-match interview with MUTV. He was also excellent in the 1-1 derby draw with Manchester City and was promoted into the Under-21s, making five appearances in total for Warren Joyce's champions - one as starter. By making 23 starts (and one substitute outing) for the Under-18s, he proved to be a key member of the side. Kieran McKenna commented after handing Warren the captain's armband in 2016/17: "Obviously, he had experience of playing in the FA Youth Cup last season but he missed a large part of the early stages of this campaign when I first came in due to injury. He has come back and been a big part in the past two months, sometimes at full-back but mostly at centre-half and he's captained the side on a number of occasions. He's a popular boy in the dressing room, a popular character in and around his peers, and another one who can be a strong part of the defensive unit." Warren made 21 appearances in all for the Under-18s in his final year before stepping up to the Reserves, where he already gained experience with nine outings, three as a starter.