The buzzword for this tie on the posters and billboards around Vigo is 'afouteza', which translates from Spanish as a fighting spirit to face trouble and adversity.
It’s a quality that has carried Celta Vigo to their first ever European semi-final and one that Jose Mourinho believes Manchester United lacked when he took over last summer.
They have had little choice but to toughen up over the course of the last 10 months, driven by a manager who demands a warrior-like attitude from his players and galvanised by a heavy fixture list. Here in the Estadio Balaidos, United faced game 58 of the season against a Celta side known for its high-energy style.