Sheedy has been on the coaching staff at the club since 2006, and is currently in charge of the under-18 side, so has first-hand experience of working under Moyes before he moved to Old Trafford last summer.
"All of you out there Moyes was never interested in our youth team or players," Sheedy tweeted after United's 3-0 defeat to Liverpool on Sunday. "In my 7 years moyes showed no intereset [sic] in our youth team."
Asked if that had "done his head in", Sheedy replied: "Yep, he did." The criticism continued. "Punt the ball up to Fellaini. Great viewing."
This was soon followed by: "We now have a Manager who wants to win games. COYB."