Well, in theory we have 4 senior centerbacks and Martinez and Alaba who both can play as centerbacks. It doesn't really make sense to buy a young German centerback. I honestly have no idea if we have a youth player who's good enough to help out. I doubt it, especially not in a game against Leverkusen. Maybe we'll see something surprising like for example Vidal at centerback. Not sure, if Alonso should play there, but then if we try to reach more than 80% possession, we might just get away with it.
Oh and Steinhardt is on the bench, he's a defender from our u23 team.