Anderson, who was limited at Wednesday's practice by an ankle issue, did not practice Thursday due to an illness, Troy Renck of Denver 7 News reports.
Fantasy owners will want to check back and see if Anderson recovers in time to practice Friday, but it's still expected the running back will be able to suit up Sunday against the Patriots. Given that Anderson was under the weather Thursday and was previously nursing an ankle issue, it's plausible that the Broncos will list him as questionable on their final Week 10 injury report, which will be released following Friday's practice.