Callum is a versatile midfielder currently playing for Manchester United's Under-18 team whilst still an Under-16. He performed well in the 2014 Milk Cup and helped United retain their title. He's capable of playing as a centre midfielder, right winger or behind a striker. He's already been praised for his intelligence on the pitch, his awareness of space, and his movement off the ball.
He became an integral part of the Under-18 side whilst still a schoolboy in the 2014/15 season and ended the campaign by making his Under-21 debut in the final game of the season. Callum captained the Under-18 side for the first time in January 2016, away to Liverpool.
Due to injury, Callum made his first Under-18 appearance of the 2016/17 season in November 2016 and later that month he scored a hat-trick away to Liverpool. He scored his first Under-23 goal away to Derby County in February 2017.
In 2017/18 and 2018/19 Callum's appearances were limited due to injuries and he was released at the end of the 2018/19 season.