Domenech is due to unveil a 23-man squad on May 11 but said he could shake things up before FIFA's June 1 deadline if he felt a player's behaviour could undermine France's performances.
"They must be clever and forget their ego to realise that the only thing that matters is the team, not them," Domenech told French daily L'Equipe in an interview published on Tuesday.
"If they don't understand that, I will need a gun. We're only supposed to give our final squad on June 1."
"We'll think about that in due time," he said of Henry.
"We'll look at every aspect and we'll make a decision but we still have one month left. I've always trusted great players and Titi is a great player."
"Qualifying was not easy and naming a squad will be difficult as well," he added. "When you have so many players that are injured or don't play in such a time, this is not reassuring."
"Beautiful babies sometimes come to the world after difficult deliveries."
