Mercedes left Bottas on a long first stint in Monza and instructed him to keep the former leader Raikkonen behind when the Ferrari caught the Mercedes after the pit stop on new tires.
Hamilton, on even fresher rubber, then picked up Raikkonen while he was trapped behind Bottas although the final winning pass from Hamilton was more due to Raikkonen's tire problems than the Bottas delay.
Vettel was racing with Raikkonen, who had beaten him in the pole, first in the first round when he made contact with Hamilton and turned around.
When asked if Ferrari had discussed how the start had to be dealt with, Vettel replied: "No, I think we are old enough and that we do not have to go through the start.
"I do my job and I am willing to race everyone.
"I tried to put my chances in the first corner, a bit in the second chicane, but it did not work, then it was a bit unfortunate with how it went.
"Everyone is free to follow any desired approach, for us it is fairly clear and straightforward."
Pushing further whether he felt that he was at a disadvantage because he had to fight his team-mate and Hamilton did not, Vettel replied: "I do not know, of course I can see the points of the questions coming.
"But for me it's pretty clear: I'm happy that I can fight with three cars, I'm glad I can fight 19 cars.
"I think I've never been in a different position there, that's fine, I do not expect anything else."
Hamilton is now 30 points free of Vettel in the championship, with respectively Raikkonen and Bottas 92 and 97 points from Hamilton.
Mercedes had said before the Italian GP that after the race it would decide if Bottas would be moved to a supporting role to help Hamilton.
However, Toto Wolff sees no need to impose team orders, as Bottas could help his teammate in Monza without destroying his own race.
Wolff said: "I do not really like team orders, they are not cool and not good for the sport, and they are not good for either driver.
"Lewis does not want anything talented and Valtteri does not want to give up, we look at it from breed to race.
"We discussed it [on race morning], different scenarios and there was no need and we will see what happens in Singapore.
"I want to reduce that moment as far as possible."
Bottas has already said that he would accept a request to help Hamilton, but insists that he was not sacrificed on Monza, where he, by extending his first stint, beat Max Verstappen to the podium.
"I do not think we really affected my results," he said. "The difference in points between me and Lewis is now very big, so I am willing to work with if it makes sense."