Brown (heel) didn't take part in practice Wednesday, Darren Urban of the Cardinals' official site reports.
Brown managed just one limited practice last week due to a heel injury, but despite receiving a questionable tag for this past Sunday's game against the Rams, he was able to suit up and turned in a season-high 12 targets into six catches for 88 yards. He'll have two more chances to mix into the drills as the week goes on before the Cardinals potentially make a similar ruling on his potential to play Sunday in Pittsburgh.