Neither club is in Europe this season and United have already confirmed their interest in playing lucrative friendlies to generate extra income
Neither club is in the Champions League nor Europa League this season and they are exploring the options of playing each other in a lucrative one-off game, almost certainly in the Middle East.
United boss Louis van Gaal's plans for the teams had been a potential sticking point but he confirmed earlier this month that he backed the idea of meeting top-class opposition midweek.
AC Milan's director Umberto Gandini confirmed a friendly with United was on the agenda.