After an impressive season so far, Mantato is set to be rewarded with a new contract, according to Fabrizio Romano.
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The Red Devils want to ensure that he remains a part of their plans for future first team games.
Darren Fletcher's twin sons Jack and Tyler have also signed new deals this week.
Mantato has been compared by some scouts to Arsenal star Bukayo Saka, while he can also play at full back.