I'd guess Hannibal is that youngster who is also injured. So we have Pogba, Van de Beek, Mata, Hannibal all injured. At that point I get it. It is what it is for Bruno. We could've played a winger as a 10 and thrown on a youth winger to start, but I can see why he wouldn't do that.
Can we just not play with a 10 at all ? We're not forced to play with one, and changing formation in such game will hardly be a problem.