Antonio Pierce often talked about bleeding silver and black during his time coaching the Raiders, the team he grew up loving.

That’s why it was stunning for fans to see him in Chiefs colors this week. Pierce, who was coached during his playing days by Kansas City defensive coordinator Steve Spagnuolo, was brought in as an adviser during training camp.

“Antonio and I have been close for a long time,” Spagnuolo said Thursday.

Pierce was Spagnuolo’s middle linebacker during the Giants’ 2007 season, which ended with a victory in Super Bowl 42. Now Pierce is doing his part to help his former mentor.

“Obviously, looking at Antonio and what he’s like now, he’s been a coach and he’s been a head coach and it’s nice to have that when you’re a defensive coordinator,” Spagnuolo said. “I have a lot

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