In Your face Lucho! For picking Matheu over him. I hope he won't do the same with Umtiti.
Imo, Lucho doesn't necessarily think that Mathieu is better as a LB.
But Lucho more or less continues where we stopped at the end of the last Season.
So, a new player can't jump right in into a team (except if you are Suarez, Neymar and similar), but you are slowly integrated into a team.
And if you play awesome, over time you will go higher and higher in the pecking order.
I never expected personally that Digne, Denis, Gomes or Umtiti will suddenly play as starters, no matter how good or bad they are.
Denis, Gomes, Umtiti will go through the same process like Digne.
At first, our players who were here in the last season will be picked as 1st options and new guys will enter as subs at the minute 60.
Guys who will play awesome (and if their opponent for their position is injured or is playing badly) will play more and more.
Guys who will play lukewarm at first will continue to get 20-30 minutes, and they won't rise in the pecking order until they drastically improve, or when their opponent gets injured or when their opponent starts to play badly.
Rafinha is probably the only exception and he will be surpassed fast in the pecking order by Denis and Andre.
But he is Rafinha and his ceiling was never too high, so we shouldn't cry about that too much.