Brown returned to practice on Monday after suffering a calf injury against the New England Patriots in Week 15.
On Friday, the Steelers ruled him questionable to play against the Jacksonville Jaguars on Sunday, but Mike Tomlin told reporters to expect to see Brown.
Brown, who led the National Football League in receptions despite having his regular season cut short by the injury, returned to practice Monday and was a full participant this week until Friday.
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However, the 29-year-old will have the hard challenge of going up against arguably the best defense in the league that features a stout cornerback duo of A.J. Bouye and Jaylen Ramsey in the secondary. He missed the last two games.
If Mickens can't return punts against the Steelers, Jaguars head coach Doug Marrone said fellow wide receivers Keelan Cole, Dede Westbrook and Marqise Lee would be considered for his replacement.
Brown has 44 catches for 705 yards and two touchdowns in nine career playoff games.