Texans coach Bill O'Brien delivered a message to defensive tackle Louis Nix through the media at the NFL Owners Meetings on Tuesday.

After praising rookies Jadeveon Clowney and Xavier Su'a-Filo for the work ethic they've shown while rehabbing from injuries, O'Brien was asked about Nix's offseason rehab work.

"I have not seen Louis Nix," O'Brien said, per ESPN. "I don't know. He’s working out somewhere in Florida I guess. Haven’t seen him."

O'Brien added a caveat, saying, "That’s their prerogative, so don’t read anything into that. When they show back up here for the offseason program, especially the younger players, the younger players need to be ready to roll. So hopefully he’s ready to go."

When asked what changes he'd like to see in Nix, O'Brien landed another shot. ""I would say the ability to make it through a practice," O'Brien said. "That would be the biggest thing I need to see."