The Portugal captain has been linked with a move away.
But Ten Hag says: "That is your assumption. That's not what he tells me.
"I work with the players we have and he is part of our planning for the season. We're delighted to have him here and we've got to get him into the team, so he's got to get fit so he can do the job we expect from him.
"We have already confirmed at every press conference that he is part of our plans. We plan with him, so we also plan around him."