The move has inspired our latest teaser - based on signings made by the Reds boss since he took over at Old Trafford.
We want to know NINE buys who played in the first-team under Sir Alex after arriving from a League One or League Two club or the equivalent of the Third and Fourth Division.
Our research suggests there are at least that number who qualify - we are counting transfers deemed first-team rather than between Academies or the youth team. Please let us know if you can come up with any more.
The answers are in the black box. Look out for another question next Thursday.