The sight of Lamar Jackson sitting on the bench in the third quarter of Sunday's game against the Kansas City Chiefs sent a chill down the spine of Baltimore Ravens fans. With the way the Ravens' defense has played in the early weeks of the season, Baltimore needs Lamar Jackson now more than ever. Here's what you need to know about Jackson's injury status going forward. MORE WEEK 4:Lamar Jackson injury updateJackson was replaced by backup Cooper Rush due to a hamstring injury on Sunday, according to the CBS broadcast. Jackson got right back up after being tackled, so it wasn't clear he was dealing with an injury until Baltimore opened its next offensive possession with Rush under center.