Signing Alonso would be perhaps the stupidest thing Ferrari could do, IMO.
I think Ricciardo will be on the phone more urgently than Sainz. He’s clearly frustrated by the lack of progress with the Renault so far and he wants to be back in a race-winning car. McLaren as a team and their car are both improving year on year and Sainz is in a good place if he’s patient: he’s got a teammate who he gets on with and who he has an edge over, and the team is growing around him. They’ve got Merc PUs on the way and in a couple of years’ time they could well be right at the sharp end.
But then they’re both decent choices for Ferrari, and Binotto’s going to be able to take his pick, so it could absolutely go either way.
Sainz looks to be very good, Perez too, but Ricciardo is definitely top level.
Ricciardo does make mistakes on occasion, though. Sainz has been hugely impressive recently, especially in races. Perez always feels an odd one: very fast, very good at managing tyres, pretty good at wringing what he can out of a car, but for some reason unconvincing as the full package. In the long term I’d have Sainz down as the safest bet, but if you want race wins in the short term then Ricciardo gets the nod.
The question is maybe how will Ferrari handle the relationship between Leclerc, who they’re now clearly fully behind, and either Sainz, who might be reluctant to lose the de facto team leader status he has at McLaren, or Ricciardo, who is going to be hungry like a dog? Or do they even overlook those two in favour of someone who’ll reliably bring the second car home one place behind Charles?