They aren't the best defensively but absolutely devastating in the attack.
Will be interesting to see if Reus makes it or not - would be a huge bonus to us if he can't make the first leg due to injury. I imagine this is their likely their line-up:
Burki
Piszczek - Weigl - Diallo - Hakimi
Witsel - Delaney
Sancho - Gotze - Guerrero
Alcacer
I think they'll start with Alcacer up top - they tend to keep him on the bench and bring him on where he's proven to be most deadly but I feel they'll want a focal point against us with two wide men either side of Gotze.
Won't be an easy game either way - that's a very good central midfield pairing right there and we'll need to be at the top of our game without Kane and Dele to match this lot.
I'd go with:
Lloris
Aurier - Alderweireld - Vertonghen - Rose
Sissoko - Winks - Eriksen
Lucas - Llorente - Son
And just go right at them with power and pace. Need Eriksen to be on top of his game for this one too.