Leggo says United are set to meet Manolas' £31m release clause to sign him from Roma this summer.
Despite another solid season in Serie A, Manolas may choose to end his time in Italy, with his club not certain to make the top four.
United are ready to help the Greek centre-half embark on a new adventure in the Premier League.
Manolas, 27, has spent five seasons with the Giallorossi, and could be ready for a new challenge.
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