The Chiefs will not have one of their top players for Sunday’s game against the Falcons.

According to multiple reports, running back Kenneth Walker will not play due to a groin injury.

Head coach Andy Reid told reporters on Friday that Walker came in with some groin tightness. Reports indicate that while Walker’s injury is not considered serious, the team is holding him out to be cautious.

Walker leads the league, averaging 109.0 rushing yards per game. He’s tallied a total of 872 yards with seven rushing touchdowns in eight games. He’s also caught 26 passes for 172 yards with four TDs.

With Walker out, rookie Emmett Johnson is in line to make his first start.

Johnson has 111 rushing yards on 26 carries with a touchdown and 14 receptions for 237 yards with a TD so far this year.