Forward
Sure, Paco Alcacer was among Dortmund's top three scorers last season and will start a number of games this season, but his penchant for coming off the bench and scoring in the second half may be the best weapon in Dortmund's arsenal.
Dortmund are a team that come alive in the latter halves of games when the opposition is tiring. Bringing on Paco Alcacer routinely during this phase has worked wonders for Lucien Favre. To employ that tactic, we may see him use Thorgan Hazard as a striker.
The younger Hazard is no slouch in front of goal himself, he has scored over 10 goals in all of the last three seasons at Borussia Monchengladbach playing as a winger. If Favre indeed intends to play him upfront, it'll be interesting to see how he combines with the linkes of Brandt, Reus, and Sancho to build up his goal tally.