"We're trying to be fair with the players," Poyet told the Sunderland Echo.
"There's not one injury. It's very difficult for individuals, but very good as a manager."
"Who, when and where depends on the club, the manager and the player. I don't like to push people out. I like to make sure they know where they stand.
"But there are options because of the quantity we have and the difficulties of keeping everybody happy."
He added: "It has to be a full agreement for everybody to be happy. It's not that we call people and tell them to get out and go somewhere."
Poyet currently benefits from the luxury of 26 fully fit players in his squad and believes it is crucial that those on the fringes still play regularly.
"I've never had it in my life with everybody fit," he said. "There's not one injury. It's very difficult for individuals, but very good as a manager.
"You can choose, but, for the players, it's not easy. There are players staying out [of the squad] who are very good players and have played at the highest level."
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