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Willie Parker admits he was shocked at Mike Tomlin's decision to step away from the Pittsburgh Steelers after 19 seasons ... but tells TMZ Sports he has no doubt the Super Bowl-winning head coach will once again roam an NFL sideline!
We spoke to the former Steelers running back star shortly after Tomlin made the tough decision to resign ... bringing an end to his reign as the NFL's longest-tenured coach after nearly two decades without a losing season.