Martin (concussion) was released by the Browns on Monday.
Martin will not practice Sunday due to being the in the league's concussion protocols, Scott Petrak of the Elyria Chronicle-Telegram reports.
The Browns signed Martin on Thursday, Anthony Poisal of the team's official site reports.
The Browns are expected to sign Martin later this week, Jeremy Fowler of ESPN.com reports.
Martin (illness) was activated from the reserve/COVID-19 list Thursday, Pat Leonard of the New York Daily News reports.
Martin tested positive for COVID-19 according to head coach Joe Judge, Dan Duggan of The Athletic reports.
The Giants signed Martin off Washington's practice squad Monday, Michael Eisen of New York's official site reports.
The Redskins selected Martin in the fourth round of the 2019 NFL Draft, 131st overall.