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The second-year player had been suspended for violating the league’s policies on conduct and substance abuse after getting arrested on weapons charges and drug violations.
Meanwhile, Foster’s addition could represent a significant upgrade for a defense that has allowed 51 points in its first two games.
The linebacker was a first-round pick in the 2017 NFL draft and made an immediate impact, starting all 10 games he played. Even though he missed six games, he finished second on the team last year with 72 tackles.
Fred Warner has been the team’s leading tackler through two games, but he will likely give up his starting job at middle linebacker to Foster beginning with Week 3 against the Kansas City Chiefs.