The young midfielder had only made two appearances for the Blues when he made his temporary switch to the Blades in the January transfer window.
He told the club website: “Before I came, I spoke a lot with Dom (Calvert-Lewin) and also Phil Jagielka, both know this club inside out and I still speak nearly every day with Dom.
“I spoke to him about the city, the club and he spoke really highly of both, I've been through quite a lot with him in a relatively short time.
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