I can't see that happening myself but they will be a bit desperate to save face after this Neymar fiasco.
Messi has, according to reports, come back like a steam train in pre-season. Faster sprint times etc. than he has recorded ever. I don't believe that part at all personally - he's nowhere near as quick as he was 3 years ago. No chance, no way. But, I do reckon he's going to be fired up this season in a way he hasn't been for years now. He'll be hurt by Ronaldo's success for sure.
It's ironic that it's a world cup year too because he'll probably put so much into the club season he'll struggle in Russia and get slated again.