Many fantasy football leagues crowned champions at the conclusion of Week 17 of the NFL season. It's standard for Week 18 to not be incorporated into the fantasy schedule, considering various teams will likely be resting key players ahead of the playoffs.
But there are some leagues that will use the final week of the NFL regular season to determine a champion. Plus, daily fantasy formats make it possible for others to get involved in the Week 18 action, should they want to do so.
For those reasons, the upcoming week still has some relevance from a fantasy standpoint.