Scolari quit the club after a year in charge having failed to achieve success in the Asian Champions League, the Uzbek side losing to Saudi club Al Hilal in the last 16 earlier this month.
"Main reason of leaving Uzbekistan is (I'm) concerned with my son's studying," Scolari told the team's website late on Friday.
"He just graduated from Tashkent International School and is about to study in university. I need to support and help him now. My family and children is most important for me."
The former Brazil, Portugal and Chelsea coach said that he would not decide upon his next job until after his son's university place was agreed.
"Maybe, my son won't wish to stay in Portugal, so I can't say anything about my next work place," said Scolari, who admitted to having offers from unnamed clubs in Europe, Brazil and Asia.
