Smith had 28 tackles and three interceptions this season for Baltimore, who lead the National Football League with 20 interceptions.
Now, he won't be getting paid for the first month of his absence.
ESPN's Adam Schefter reports that the seven-year veteran will use the time off to serve a four-game suspension for violating the NFL's policy on performance-enhancing drugs.
Smith had to deal with a sore Achilles for much of the season and it has led many to wonder if it had contributed to the tear. Harbaugh said Maurice Canady will be one of the guys in the rotation filling in.
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The Ravens later revealed Smith has been nursing a sore left Achilles for much of 2017.
"I knew about it before the injury", head coach John Harbaugh said Monday. "It's a broad array of different things that guys can get involved with, different supplements and things like that". We have a lot of good, young players. The Ravens signed free agent cornerback Brandon Carr over the offseason and used their first-round draft pick to select Marlon Humphrey out of Alabama. While he has technically only made one start in 12 games, he has recorded 25 tackles with two interceptions and eight passes defensed, the takeaways coming over the span of the previous three games. He's a very instinctive player, so I see him playing a lot in the upcoming games. "Our offense needed to step up and they did, and I'm really proud of them for that".
On the season, the Ravens rank third in total passing yardage allowed and eighth in yards per attempt. "He plays inside and outside", Harbaugh said of Canady. "So, we're not going to sit back and be sorry for ourselves".