The France international started the campaign in impressive fashion, providing seven assists in his first four Premier League outings of the season, but the 28-year-old's performances have taken a dip in recent weeks.
Pogba's contract at Old Trafford is due to expire next June, and it is still unclear whether the midfielder will be committing his future to the English giants.
According to Condo, Ronaldo's return in the latter stages of the summer transfer window has left Pogba feeling overshadowed at the club.
"After the arrival of Cristiano Ronaldo, Pogba no longer feels like the great Manchester United star. He is no longer the center of attention. And in the last few matches Pogba's performance has dropped a lot," Condo told Sky Italy.