However, he appears to have made a quicker recovery than staff were expecting, per the Manchester Evening News.
Ederson injured his shoulder in a challenge against Willy Boly of Nottingham Forest recently.
Backup keeper Stefan Ortega, who admits he may leave in the summer, will deputise until he is fit.
"At the end it's not my single decision, my (wife) is there as well, we're expecting the second child," Ortega said about his future last month.
"I'm not in the beginning of the 20s so I have to choose wisely now what I'm doing in summer. It's not that I have to push the club that they will sell me, it's just like see what happens. I'm relaxed because there are worse places than here.
"My family and me are really happy here. My wife struggled a bit in the beginning but I think it's normal to go in a different country. Now everyone is happy.
"I'm happy to be here because it's one of the biggest clubs in the world. The target is still the same, I'm ambitious from the beginning and this is what I try to do every day."