Aguero don't play this week in champions against juventus?
They should just go for the champions league, they've already won the EPL in recent times there is nothing more to prove. Arsenal's philosophy is make the top 4 every year and do your best in the champions league and its worked very well for them going deep a few times - very good considering there are many bigger clubs then them.
Bad results on Champions League, can very easily to spoil the chemistry in team. Last seasons City played very poor in CL, and i think that players they want to change that. it will affect their maximum in PL.