It's really a major issue and I read on few articles the punishment might be bigger than Juventus, Juventus was get 15 points deduction, to be honest it's really big enough since it will make Manchester City is high likely can't become a champion.
Manchester City players are mostly best of the best players, it's really a huge lose if they will leave since it will hurt Manchester City next journey.
I hope it's just a point deductions, at least Manchester City have a chance to win in Champions and FA Cup.
Current situation with points deduction are waiting for Manchester City in Primer League after investigating by FA, I hope Manchester City still having consistent performance in Champion League. Have possibility and rumor about Manchester City will get points deduction in Primer League but his participants in Champion League will disqualify or not.
Learned from Juventus 15 points deduction in Serie A not bring impact in Europe League playoff participant, seems Manchester City can focus 100% in Champion League without any punishment although possibility with points deduction in domestic league.