From Sir Alex Ferguson to Jose Mourinho to Diego Simeone, the IFFHS has named the best of the best managers in club football from 2011-2020.
The Red Devils have endured a torrid start to the new season, taking just seven points and sit 15th in the Premier League.
From Jose Mourinho to Massimiliano Allegri to Arsene Wenger, Bleacher Report has ranked the top ten managers out of work in the world.