Guys, I dont know if it has already being discussed here (I think it hasent). Kaltenborn gave an interview saying that Sauber wont be open to a in-season switch with Mclaren.
https://www.racer.com/f1/item/139206-ka ... nda-switch
That leaves Mclaren left with only one option. If they really wanted to get rid of Honda, they would have to cancel the contract and pay Honda out, which is even more unlikely than the other scenario ever was.
However, there is mounting evidence that Sauber will use Honda engines in 2018 and that this deal will be announced shortly.
http://www.express.co.uk/sport/f1-autos ... nvolvement