The Jacksonville Jaguars announced that linebacker Myles Jack entered the concussion protocol during his team's Thursday night game versus the Tennessee Titans.
Per Phillip Heilman of The Athletic, Jack appeared to take a knee to his helmet in the third quarter.
The 24-year-old UCLA product emerged as a high-upside playmaking linebacker during his time with the Bruins, for whom he also played as a running back. His stock peaked inside the top 10 before concerns about knee problems caused him to fall into the 2016 draft's second round.