NFL Network insider Jason La Canfora reported late Sunday that initial tests revealed Kaeding suffered a left anterior cruciate ligament tear, according to a source with knowledge of the situation.
"He planted, and he kind of got spread out," Turner said Monday. "There was no contact on the play."
Kaeding came into the season as the most accurate kicker in NFL history, having made 86.5 percent of his field-goal attempts -- 173 of 200 -- in his seven NFL seasons.
"Nate's unbelievable how good he's been, and we'll get someone hopefully who can be as accurate," Turner said.
The Associated Press contributed to this report.