Both players suffered injuries in Sunday's win over the Ravens. Spiller was able to return to the game after an ugly fall that caused his ankle to get twisted. Like most ankle injuries, the Clemson product probably had some swelling in the following days, which caused him to be limited in this week. He's shaping up as a full-blown game-time decision.
Jackson did not return, but he was a full participant in practice on Wednesday.
Fantasy impact: It's a bit unfair for Spiller to have such a short turnaround, and he's likely going to be less than 100 percent against the Browns. Cleveland's defense has been outstanding so far, ranking first in yards per carry allowed and fourth in rushing yards allowed. Spiller should be viewed as a flex as long as he's active, and F-Jax would be a must-start with C.J. out of the lineup.