The 18-year-old, who moved to Old Trafford from Charlton in summer 2009, has joined the Shrimps until March 31 with an option to further extend his stay.
McGinty is equally at home in the centre of defence or at full-back and was a member of United’s victorious 2011 FA Youth Cup side.
This season the Republic of Ireland Under-19 international has progressed to become a regular in the Barclays Premier League champions’ reserve set-up.
Boss Jim Bentley will have McGinty at his disposal if required for Tuesday night’s npower League Two clash with Dagenham.
Fiorentina captain Davide Astori has died at the age of 31.
Aberdeen boss Derek McInnes believes his side's form is being affected by a poor pitch at Pittodrie.