PITTSBURGH Steelers head coach Mike Tomlin has taken action after a costly mistake against the Seattle Seahawks.

The Steelers suffered a 31-17 loss last Sunday as the Seahawks pushed for a late rally in the final quarter.

A mistake from rookie running back Kaleb Johnson has cost him his place as an NFL starter.

The 22-year-old will not continue as the Steelers' kick returner after costing them a crucial touchdown.

This comes after the Steelers faced calls to fire Johnson for his error.

With the Seahawks just three points ahead, Jason Myers launched a long-range kick-off early in the fourth quarter.

Returner Johnson let the ball bounce over him before casually walking away from the ball.

Johnson had thought that the ball had gone dead, despite the NFL's new dynamic kick-off

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