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The Green Bay Packers signed defensive tackle Luther Robinson to the active, 53-man roster on Thursday afternoon.

Robinson was promoted from the practice squad almost three hours before the Packers' game against the Minnesota Vikings. He spent the season's first four weeks on the practice squad.

The roster move could be an indication defensive tackle Josh Boyd will not play against the Vikings. Boyd was listed as doubtful with a knee injury.

The Packers' active roster has been stuck on 52 players for the past three weeks, since linebacker Andy Mulumba was placed in injured reserve with a torn ACL against the New York Jets. Earlier this week, the Packers lost cornerback Jumal Rolle from its practice squad. Rolle was signed to the Houston Texans' active roster.

Robinson, a 6-foot-3, 301-pound rookie from Miami, joined the Packers in May as an undrafted free agent after participating in the team's rookie orientation camp on a tryout basis. He will wear No. 97 for the Packers.

-- rwood@gannett.com and follow him on Twitter @ByRyanWood