Mekari underwent a procedure on his back and will miss some time, Mike Garafolo of NFL Network reports.
Hall signed with the Texans on Monday.
Spector signed a contract with the Jaguars on Monday.
The Jaguars placed Hughes (undisclosed) on injured reserve Monday.
The Texans are optimistic that Noel (hamstring/finger) will be available for the team's regular-season opener against the Bills on Sunday, Sept. 13, Aaron Wilson of KPRC 2 Houston reports.
Coach DeMeco Ryans said Monday that he's unsure if Dell (knee) will play during the Texans' preseason slate, Aaron Wilson of KPRC 2 Houston reports. "With Tank, he's on his own plan," Ryans noted. "Whatever that entails, geared toward what's best for Tank Dell."
Mullens (undisclosed) is unlikely to return to practice this week, Michael DiRocco of ESPN.com reports.
Coach Liam Coen is considering playing starters, a group that would include Lawrence, in Friday's preseason game against the Panthers, Michael DiRocco of ESPN.com reports.
Noel recently sustained a hamstring injury that will likely keep him from practicing for "a few weeks," Aaron Wilson of KPRC 2 Houston reports.
Meyers did not suit up for Saturday's 24-20 preseason victory over the Saints.
