selected games

Van Foreest,J-Rosner

Two Knights 3..Nf6

GRENKE Chess Open 2019 rd5

White came up with 5.a4!? which does not seem to do very much but is not mentioned by Fernandez in The Modernized Caro-Kann(Thinkers Publishing 2018). Black responded with 5..e6N and the game was already in new territory

After 19.Nc4(Diagram)

White has ideas like a4-a5 and/or Nd6

What do you recommend for Black?

After 19.Nc4