Unai Emery substituted Alexandre Lacazette in Arsenal’s draw with Totteham on Saturday.
It was not the first time Lacazette was substituted and looked quite upset. He lasted just 56 minutes in the north London derby and was hooked after missing a good opportunity to double Arsenal’s advantage.
But Emery has warned the striker that he and Aubameyang must accept his decisions.
Asked about Lacazette being unhappy when he is substituted, Emery said: "They need to accept the decision. ‘I am finding the best decisions for the team and they are playing other matches.
"Sometimes I am not happy with them both when their performances are not good when they’re both playing, but I am very consistent in our work to take the best decision and to give them the best performance for us, whether they’re playing together or alone. "For example, next match it is not possible to play both because of the red card in Europe for Lacazette. I can only play Aubameyang."