Black will draw the start during Thursday's road preseason game against the Lightning, Jameson Olive of the Panthers' official site reports.
Demko signed a two-year, two-way contract with the Panthers in early June, and he'll get a tune-up during the team's penultimate preseason game. He hasn't yet made his NHL regular-season debut, but he went 25-13-4 with a 2.47 GAA and .903 save percentage across 42 regular-season appearances with AHL Charlotte last year.