According to ESPN.com, Jaguars coach Gus Bradley said Robinson needed six weeks to recover from the injury, meaning he wouldn't be able to return to action this year.
Robinson said he sustained the injury on the third play of Jacksonville's loss to the Houston Texans on Sunday. He remained in the game, totaling 30 yards on 10 carries. According to ESPN.com, Robinson was wearing a protective boot on his foot earlier Wednesday.
The second-year pro was the Jaguars' leading rusher this season with 582 yards on 135 carries, adding four touchdowns. After becoming the team's starting running back in Week 7, Robinson rushed for 329 yards on 5.8 yards per carry the next three games, though he hasn't had more than 60 yards in Jacksonville's last four games.
"[Robinson] came in and was fighting for opportunities, as far as getting the ball," Bradley said Wednesday. "When he did, he had a period of time there where he put up some really good numbers, just ran extremely hard [and] did some very good things for us.
"[He] gave us some confidence in the run game because of what he did and what he showed. I thought he made really good progress."
A fifth-round pick of the Jaguars in the 2013 NFL draft, Robinson had just 20 carries last season and appeared at both running back and receiver after playing quarterback in college at Michigan. He moved to running back full time before this season.
The Jaguars are 2-11 this season and in last place in the AFC South. They play the Baltimore Ravens on Sunday.
- Ben Estes