BEREA, Ohio — The Browns’ first significant injury of 2020 is self-inflicted. Cleveland might have a second one.

Pro Bowl running back Nick Chubb has been placed in concussion protocol after he sustained a head injury while being tackled around the neck by starting linebacker Mack Wilson during the team’s first fully padded practice on Monday.

And not long after first-year Browns coach Kevin Stefanski announced Chubb’s concussion on Tuesday, Wilson, who was demoted to the second-team defense for hurting his teammate, sustained a left knee injury.