Johnson had been listed as questionable. He practiced Friday wearing a cast around his left hand.
He said late last week that the pain had improved every day. On Friday, he said the pain level was at 4 on a scale of 1-10. On Thursday, he said it was at 6.5.
The injury happened late in the second quarter of the Cardinals' 31-7 loss to the New Orleans Saints on a special-teams play. Johnson was attempting to tackle Darren Sproles and was knocked to the ground.
When Johnson sat up kneeling, he noticed blood was coming out of his left glove. After doctors cut the glove off, they saw that the fingertip was still stuck in the glove. Johnson did not return to the game.
His profile has skyrocketed this past week. He's drawn the attention of the national media and has been a topic of discussion throughout the country.
ESPN NFL Insider Adam Schefter and ESPN.com Cardinals reporter Josh Weinfuss contributed to this report.