Fantasy Football managers don’t have to worry about bye-week replacements until Week 6. Unfortunately, a few prominent NFL players suffered injuries in Week 4, putting their Week 5 availability, and for some their season, in doubt. Broncos running back Javonte Williams sustained a knee injury during the team’s matchup against the Raiders. Though the team is waiting for MRI results, the initial reports indicate Williams has a significant injury. Dolphins quarterback Tua Tagovailoa suffered a concussion on Thursday night which sparked a league and NFLPA investigation into the concussion protocol. Plus, Colts running back Jonathan Taylor is undergoing testing on his ankle.