Jourdan's tweet: "Sean McVay says Terrell Lewis had to have a knee procedure because of a fear there was an infection from a prior injury. Lewis will go on
NFI and team expects him back - McVay says “it’s as positive as it could be” under circumstance. That is the spot that Calais will take."
'
NFI' is non-football injury (or non-football illness). From Wiki: "Players on the reserve/non-football injury or reserve/non-football illness lists are ineligible to practice or play in games for the first
six weeks of the regular season. After six weeks, a player can begin practicing with their team but cannot be moved to the active roster until after the team has played its first eight games of the season. When a player starts practicing, a three-week window begins in which the player can be moved to the active roster. If a player does not get activated after the three-week window ends, they must remain on the reserve/NFI list for the rest of the season. Only up to two players from the NFI lists are eligible to return to the active roster for each NFL team." [
en.wikipedia.org]
If he was on IR (injured reserve) he could return in 3 weeks.
AlbaNY_Ram