The 20-year-old, who made his United first-team debut in the Europa League clash with Astana in November 2019, returns from his temporary move away from the club.
Levitt made his senior international bow in September as Wales beat Finland in the UEFA Nations League. The Bodelwyddan-born prospect has since earned four caps for his country.
The news follows confirmation that keeper Matej Kovar has returned from a spell at Swindon Town but another of our young loanees, forward Max Haygarth, has completed a permanent move to Brentford, after making his senior bow for the Bees this season.