San Francisco elevated Spence from its practice squad Saturday for Week 3.
The 49ers released Spence (concussion) on Tuesday.
Spence suffered a concussion during Thursday's preseason game against the Texans, David Lombardi of The Athletic reports.
Spence left Thursday's preseason game against the Texans to be evaluated for a concussion, Aaron Wilson of ProFootballNetwork.com reports.
Spence signed a one-year contract with the 49ers on Monday.
Spence was signed to Washington's active roster Thursday.
The Patriots signed Spence to the active roster Saturday, Mike Reiss of ESPN.com reports.
Spence signed a contract with the Jaguars on Friday.
Spence was released by the Eagles on Monday, Les Bowen of The Philadelphia Inquirer reports.