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The two-time Pro Bowl wide receiver has been sidelined since July 26, when he strained his right hamstring.
The sixth-year pro showed no ill effects in his return, running crisp routes and catching everything thrown his way.
"It felt good getting back out there," Boldin said.
"I'm ready to go full [speed], but at the same time I'm still being cautious. There's no need to rush it. "
Cardinals coach Ken Whisenhunt was pleased with Boldin's progress and said the 6-foot-1, 217-pound receiver should be ready to play Saturday against Kansas City.
"It's good to see him back out there," Whisenhunt said. "We're excited to see him get through the week of practice and play in the game."
Boldin missed four games because of injuries last season but still tallied 71 receptions for 853 yards and a career-high nine touchdowns.
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