The designation means he no longer counts toward the team’s roster total, and it’s expected he won’t suit up this season. Alonso tore his ACL during an offseason workout on July 1st and had successful surgery a couple of weeks later.
Being on Reserve/NFI means anywhere between the end of Week 6 (Oct. 14th) and the end of Week 11 (Nov. 18th) that Alonso, if cleared to do so, could begin practicing with the team. His first day of practice would kick start a 21-day evaluation period where the team could determine whether he would be fit to return to the active roster or being placed on season-ending Reserve/NFI.
Knowing most ACL rehabilitations take seven to nine months it’s considered very unrealistic that Alonso would be able to return to the practice setting only four months removed from surgery at the tail end of the five-week practice window afforded by the Reserve/Non-football injury designation.