It’s not clear exactly how much time Detroit Lions running back Kerryon Johnson could miss with the knee injury he suffered on Sunday, but it does appear he will be out for at least a bit.

According to ESPN’s Adam Schefter, Johnson is expected to miss “some time,” and the former Auburn standout’s injury will be week to week at this point.

Before suffering the injury, Johnson had five carries for 23 yards in the Lions’ 42-30 loss to the Minnesota Vikings. Through six games, Johnson has 308 rushing yards and two touchdowns, along with nine receptions for 126 yards and a receiving score.

Johnson was expected to have a big workload this season after compiling 854 total yards in 10 games during his 2018 rookie campaign. And that had been the case so far this year, as Johnson was already nearing his carry total from last season.

But with it being unclear how long Johnson will be out, it could be a while before the former Tiger’s sophomore season gets back on track.

The Lions will try to move on without Johnson when they host the New York Giants on Sunday at 1 p.m. ET on FOX.