After weeks of negotiations, TMW says United have accepted a £15m offer from Juve for the England international.
United had been seeking £25m to sell, but with Juve the only serious suitor they were forced to drop their initial valuation.
United also will enter talks with Sancho over a pay-off for the final year of his contract. The winger will join Juve on drastically reduced terms.
Juve are offering terms to Sancho of a four-year contract worth a total of €6m with no option for another year.