The Portugal international has had a peripheral role at United this term, starting just once despite being their top scorer with 24 goals last season, and there is persistent speculation he is seeking a move away.
He recently hit out at the "lies" surrounding his United future, but Ten Hag expects the Portuguese forward to stay put until at least January, insisting they see eye-to-eye after "several" discussions.
Ten Hag, who will be targeting a third successive win when his United side visit Leicester on Thursday night, said: "We are happy with him, he is happy to be here and we want to make the season a success together.
"It is clear. We are on one page and he knows what the demand is. You can see in training, it's clear he has the capabilities.
"He will fit in, I don't have to explain he's a great player, he has great capabilities so he will fit in every system or in every style."
Ten Hag was speaking on the eve of deadline day as the club close in on the £80million signing of Ajax forward Antony.
The manager, who has also signed Tyrell Malacia, Lisandro Martinez and Christian Eriksen this summer, does not envisage any more deadline-day deals on Thursday, when the transfer window closes at 11pm.
Ten Hag said: "We have more options in several positions. We are really happy with the players we brought in, they give us a good feeling, they are quality football-wise but as people they suit Manchester United.
"All the top clubs in the Premier League spend a lot of money in the summer, if you want to compete at the top, you don't have a choice.
"If you want to play for the first four positions you have to do it. I think we have the ambition, especially in the long-term, to play for trophies. We had to do this, I think."