Manchester United face a return to the Nou Camp 20 years after their dramatic final victory over Bayern Munich at the ground.
United have a 1-0 deficit to overturn as they go back to the Nou Camp in the year of their 20th anniversary of that last-gasp final win over Bayern.
It is a formidable task considering the Catalans have lost at home just three times in the last three years in all competitions.
They need their big players to step up and none more so than £80m striker Romelu Lukaku . He has scored just six times in the last 16 games and those came with three back-to-back doubles, including the win over Paris Saint-Germain which got them through to this stage.
Manager Ole Gunnar Solskjaer has a decision to make on whether to persist with the big Belgian or opt for the more mobile, pacy Marcus Rashford and try to hit their hosts on the break.