Coach Mike McCarthy might have to go through the Green Bay Packers locker room and start soliciting volunteers to play tackle because, three weeks into the season, his top five are injured. It’s unclear who will be available Thursday night when the Packers host the Chicago Bears at Lambeau Field. But the two guys who started at tackle Sunday against Cincinnati — Bryan Bulaga and Kyle Murphy — both were on the injury report as non-participants in practice Monday. Their status was an estimation because the Packers won’t actually practice until Tuesday, but it’s a pretty good sign that both are banged up. In his first start of the season, Bulaga aggravated the right ankle injury that had sidelined him the first two games, although it was not clear if he re-injured it on a specific play. He dropped out of the game in the fourth quarter and was seen on the sideline testing it, but he did not return. Justin McCray filled in for Bulaga and would be the starter if the veteran were not able to play against the Bears. But the Packers might have even bigger problems at left tackle. Kyle Murphy started for a second straight week in place of David Bakhtiari (hamstring) and made it through the entire game. But he was listed on the injury report with a foot injury and his status for the Bears is up in the air. The Packers must have felt it was serious because they were in the process of signing Arizona practice-squad tackle Ulrick John to their 53-man roster, according to John's agent, Leonard Roth. It means they will have to clear a spot on the roster for the 6-5, 307-pound John, who has played in five games in three-plus seasons with Indianapolis, Miami and Arizona.