Former Barca player Juan Antonio Pizzi replacing Jorge Sampaoli as Chile coach could be a problem for Bravo continuing to play for Chile.
Sport says it is because of a comment made by Pizzi's assistant Manuel Suarez.
Apparently, Pizzi's assistant said Bravo was just a run-of-the-mill goalkeeper, something Bravo eventually heard and did not like.
I don't think the issue would be him leaving, but getting dropped by the new coach instead. It'd be a really stupid move, but then, just making a comment like that or even holding that opinion is pretty stupid.
Zamora trophy has several factors but the overall percentage depends on "goals-to-games" ratio (https://en.wikipedia.org/wiki/Ricardo_Zamora_Trophy). Since Oblak has 5 more games (due to early season injury), the more clean sheets Claudio gets while Oblak gets scored upon the closer he gets to trophy.