Blackshear signed his contract tender with the Panthers on Thursday, Anthony Rizzuti of USA Today reports.
The Panthers tendered a contract to Blackshear on Monday.
Blackshear finished the regular season with 14 rushes for 46 yards and six catches on seven targets for 45 yards in 12 games. He also returned 16 kickoffs for 430 yards.
Blackshear played four of 80 snaps on offense and carried once for four yards to go with one reception for four yards on two targets in Sunday's 28-6 loss to the Saints. He also brought back two kickoffs for 37 yards.
Blackshear (groin) was a full participant in Thursday's practice.
Blackshear (groin) was a limited participant at practice Wednesday, Darin Gantt of the Panthers' official site reports.
Blackshear rushed five times for 18 yards and caught his only target for four yards in Sunday's 42-21 loss to the Dolphins.
Blackshear (coach's decision) is inactive for Monday's matchup against the Saints, David Newton of ESPN.com reports.
Blackshear is a part of the Panthers' initial 53-man roster following roster cuts Tuesday, Joseph Person of The Athletic reports.
Blackshear rushed once for two yards and caught both of his targets for four yards in Saturday's 27-0 preseason loss to the Jets. He also returned two kickoffs for 37 yards and one punt for 10 yards.