They may practice without counting against the 53-player roster limit for a period of up to 21 days.
Both players remain on the reserve lists where they were placed Sept. 1.
Ogbuehi (pronounced “o-BWAY-hee”) was the Bengals’ first-round selection in the 2015 NFL Draft, 21st overall.
It was known he would not be ready to play in roughly the season’s first half, due to a knee injury he suffered in his final college game for Texas A&M, in December of 2014.
Porter has been out due to a knee injury that predated the opening of Bengals training camp.
Both players could be activated to the roster at any time during the 21-day period, per club decision, but they will not play this week against Houston on Monday Night Football.