Around 25% of the players in the NFL at the current time are undrafted free agents. That means that some of your favorite players never got their name called in the three days of the NFL draft but instead had to sign in the NFL as a priority free agent. There are a handful of players in 2019 who signed with NFL teams that have the ability to impact the fantasy football landscape right away. While UDFA running backs are generally the players we think of as having an impact right away, there are a few undrafted free agent wide receivers who I think can make their teams and play this season.