After the brilliance of the win against Sporting Gijón in Asturias over the weekend, Luis Enrique takes his men in Blaugrana to Germany for a game against the hugely impressive Borussia Mönchengladbach. After much success under Lucien Favre, Andre Schubert has taken the baton from his predecessor and ran with it. It will be a particularly poignant occasion for Marc-André ter Stegen - returning to "the club of my (his) heart".
Gladbach will pose a much bigger and more incisive threat than Celtic were in Matchday 1. They have a great record of producing upsets in big games - just ask Bayern Munich.