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Greiss tested negative for the mumps and has been cleared to rejoin the team.
Marc-Andre Fleury will start in goal for the Penguins on Thursday.
Greiss makes for a short-term speculative pickup, given starter's Marc-Andre Fleury's current sickness.
Greiss allowed three goals on 27 shots in a 4-3 shootout loss to Columbus on Saturday.
Greiss allowed three goals on 31 shots in a 3-0 loss to Vancouver on Thursday.
Greiss made 32 saves in a 3-2 win over the 'Canes on Saturday.
Greiss took the loss Saturday against the Islanders, yielding four goals on 35 shots.
Greiss will start Saturday against the Islanders, Dave Molinari of the Pittsburgh Post-Gazette reports.
Greiss turned aside 30 of 31 shots in Friday's 2-1 win over the Maple Leafs.
Greiss made 33 saves in a 4-1 win over Minnesota on Tuesday.
Greiss blew a two-goal lead in the final three minutes of the third period Thursday against the Red Wings, then lost in overtime. He ended up allowing four goals on 31 shots.
Coach Mike Johnston hinted Wednesday that Marc-Andre Fleury could start both Thursday against Dallas and Saturday versus the Islanders.
Greiss could start between 20 and 25 games for the Penguins in 2014-15.
With the Penguins placing Jeff Zatkoff on waivers Saturday, Greiss has won the backup goalie job.
Greiss stopped eight of nine shots and outplayed fellow backup Jeff Zatkoff on Monday.
The Penguins signed Greiss to a one-year, $1 million deal Tuesday.
Eight teams have reached out to Greiss' agent, reports Sarah McLellan of the Arizona Republic. He becomes a free agent on July 1.