He had five catches for 37 yards.
"When he was walking off the field, the kind of pain he was in ... let's hope it's something that's not serious," Caldwell said.
Garcon said his finger wasn't broken. He said he would take some painkillers for the finger and "see how it feels ... play it day by day, really."
Before leaving, Addai carried 17 times for 128 yards and a touchdown, while Garcon had four catches for 103 yards and a score.
The Associated Press contributed to this report.