I don't think Chelsea would risk the lad if he had the potential to put him out for a long time. I'm hoping Spain don't call him up for the next break so he can have 2 weeks off.
It's a bit hypocritical of Jose to ask for Spain not to call him up but continue to play him himself really.
Which is highly unlikely. They don't really have anyone of Costa's calibre to replace him with. Hopefully, he will be left out. It depends on who Spain faces, and to be honest I haven't checked yet.
Edit: Slovakia. They could afford leaving him home, but they probably won't.
I'd be surprised if they left him home, but I wouldn't be if they started Paco Alcacer. He's looked a much better fit for the national team than Costa.