Ferriero was standing in front of the net when he grabbed a rebound of Logan Couture's shot and put the puck past goalie Jason LaBarbera with 4:11 remaining. San Jose (3-0) had failed on its first five power plays.
LaBarbera made 29 saves for Phoenix (2-2), which was outshot 30-28. The teams combined for only seven shots in the second period.
Sateri would be insurance because San Jose has already signed Thomas Greiss to be the top backup. Niittymaki had hip surgery this week and is expected to miss 12 weeks. Niemi hasn't practiced with the team after having a cyst removed a week before training camp.
Sharks regulars Joe Thornton, Patrick Marleau and Dan Boyle all sat out after making their preseason debut Friday night in a 5-1 win over Anaheim. They are expected to play Sunday in Vancouver against the Canucks.
Copyright by STATS LLC and The Associated Press
Arena: SAP Center Location: San Jose, California
Referees: Dan O'Halloran, Steve Kozari Linesmen: Brian Murphy, Don Henderson