F1's currently-dominant team permitted its two drivers to engage in a classic scrap for victory in the Bahrain Grand Prix, in which they overtook each other several times before Hamilton took victory.
Mercedes received praise for not subjecting its drivers to team orders, beyond a vague instruction from race team chief Paddy Lowe not to take each other out.
But Wolff suggested the squad's policy would probably have to shift if more drivers started to become a threat to Rosberg and Hamilton, who have dominated thus far.
"Bahrain was particular because our package worked very well and we had quite a competitive advantage there, so it's easier to take a decision for the sake of racing because you know you're going to have quite a margin to the car in third place," Wolff explained.
"The more narrow that margin gets the more you have to look out for competitors, and our rule number one is that the team-mate is not enemy number one, the competition is, and there might be situations in the race when you have to consider that fact.
"You cannot [afford to] lose lots of time in a battle if you have your enemy right up your back."
Mercedes has now scored three straight one-two finishes, with Hamilton leading Rosberg home in Malaysia, Bahrain and China.
- Sports & Recreation
- Bahrain Grand Prix