Lucky escape for Barcelona, I thought they'd get disqualified, I'm happy as a Barcelona fan though.
I remember vividly that Real Madrid got disqualified for the exact same reason in 2015 when fielded ineligible Denis Cheryshev.
Real situation wasn't exactly same, because Cheryshev was player of main team. I'm not expert, but from what I read it looks that reserve team players have different status than main team players and it was used as excuse by Barca. But Real had same story like Barca in 2016 with reserve team player Alvaro Tejero and they also faced no sanctions.
Quite unexpected result today - Getafe just smashed Deportivo Alaves 4:0. Alaves playing really poor in recent weeks, I highly doubt that they will remain in Europa league spots for long.