Quentin will have surgery at a later date and it will be his third knee surgery since March 2012.
Quentin, who turned 31 today, has not played in a game since July 30. The team put him on the 15-day disabled list with a strained knee two weeks ago.
Quentin was batting .275 with a team-leading 45 RBI and 13 homers this season for the Padres. LEMIRE: MLB Power Rankings: Cardinals return to No. 1 thanks to recent hot stretch