I think it's clear what will happen in the next days, given the leaks we have been reading since the Bayern game
Laporta and Jordi have already made up their minds that they will sack Koeman and trust Martinez to replace him.
They currently have the money to pay 12m to Koeman, and 1.5m to Belgian Federation, thanks to getting rid of Messi's and Griezzy's wages (even if that means less money for the winter transfer window)
When that will happen?
According to what we hear, Martinez does want to compete with Belgium in the Nations League finals (7-10 Oct).
This means that Koeman will be the coach up to the game against Atleti away, after which it will be made public that he is sacked, and Martinez will take over after Oct. 10th and will be the coach against Valencia at home on Oct. 17th
Meanwhile, Koeman knows they will sack him, and judging from the statement today in the press conference,
the next 2 weeks until the Atleti game are not gonna be beautiful...