The 2011-12 season was an annus horribilis for Manchester United for a number of reasons.
However, amid all the drama of Sergio Aguero delivering Manchester City the Premier League title at the eleventh hour, Sir Alex Ferguson’s other big humbling often gets forgotten.
United’s European exits under Ferguson after their last Champions League triumph fell into a few distinct categories, from honorable defeats against unstoppable Barcelona sides to the relative self-sabotage against Bayern Munich in 2010 and Real Madrid three years later.