Jackson has topped the 100-yard rushing mark in each of the last three games and his 617 rushing yards rank fourth in the NFL and second in the NFC behind Minnesota's Adrian Peterson (684).
The Oregon State product, in his sixth season in St. Louis, broke the Rams' rushing record in last week's loss at Tampa Bay. He now has 7,324 yards and passed Eric Dickerson's mark of 7,245 yards with a 3-yard run in the second quarter.
Jackson's fractured finger is the ring finger on his left non-dominant hand, but he will wear some kind of protective brace during Sunday's game.
"We're going to experiment with a couple different things," he said. "It will be some sort of soft cast to protect the ring finger. … Something that's functional that will allow me to carry the ball, catch the ball, hold the ball. So we're going to play around with it, we've been experimenting. We started today. I think I found sort of the feel of what I like. We'll see what we come up with (Friday) and then make a decision from there."