Buffalo also announced the signing RB Phillip Tanner on Tuesday to add some depth while Spiller is recovering from a broken collarbone.
There was some speculation that Spiller could be done for the season, but short-term injured reserve seemed like an option after reports indicated that he was going to undergo surgery, which could allow him to return in 4-6 weeks.
Spiller, 27, is in the final year of his contract and will make a base salary of just $1,748,750 for the 2014 season. Even after the injury and a few disappointing years, he should be a sought after player if he ends up reaching the open market next year.
Over the course of six games, Spiller has ran for 234 yards on 68 carries (3.4 YPC) while contributing 13 receptions for 106 yards receiving and a touchdown. Pro Football Focus rates Spiller as the No. 44 running back out of 56 qualifying players.