Given that he didn't give Simeone or Paz even a few minutes of playing time against Switzerland and preferred to field Jose Manuel Lopez instead, i believe we will never see them play unless someone gets injured.
Imo he should have used them a long time ago but like many other coaches Scaloni has his own "obsessions" and no one can tell him anything since he's so successful.
My only hope is that now that the team's other stars (Enzo, Mc Allister, Julian, Lautaro) have also scored, they might feel more at ease and perform better in this match.
I don't expect 39y old Messi to be tha x factor against 25y old players most of whom play in the Premier League at high intensity.
They know very well that they are making mistakes. Both Messi and Scaloni admitted that they aren't playing as they expected.
Thing is at the end of the day, they know football and tactics better than anyone of us.
All I can tell you is Scaloni did say he's assessing possible changes but didn't shed light on them.
Also, some football experts said the reason behind Paz non inclusion is because his position overlaps with Messi's prefered spaces which makes it harder to have Paz.
Simeone is being considered for right wing option.
And, yeah Scaloni did get criticized for not having Simeone who could provide pace and width after Verde's match but I think Scaloni has preference for chemistry and balance of this core.