Marcus Rashford is expected to stay with the club, according to the manager.
Paris St-Germain have a long term interest in the player.
The England forward is wanted by Ten Hag to stay at Old Manchester.
"He's important, you have seen from the first day I'm here, I'm really happy with him, I don't want to lose him, he's definitely in our plans at Manchester United," he stated.
After missing the start of the season with a shoulder injury, Rashford failed to make an impact.
He lost his place in the national squad after scoring four goals in 25 appearances in the premier league
He was in the starting lineup for Sunday's opening game of the premier league.
After a week in which they lost to the Seagulls and withdrew from talks with former West Ham and Potters forward Marko Arnautovic, United are in talks with a player from the Italian club.
Ten Hag is adamant that he is on the same page as the club with regards to potential signings.
When the transfer window closes on 1 September, he said, we have to. I'm pretty sure we'll have.
He said he was happy and that they were cooperating well. I can't discuss players under contract.
There will be no Anthony Martial or Victor Lindelof for Saturday's trip to Brentford, but there is a chance that he could return.
Ten Hag said that he had had a good week. He has had two games so far this season. Tomorrow, we will see.
The Euro League is being discussed on the radio.
He is wanted by Paris Saint-Germain to strengthen the attacking line. He is the player they want, but I don't think they will let him go and he will be happy at Man United.
It was interesting to move to a person like him. Even though he is talented, he has been out of form for 18 months and needs to get back to his best.
The agent was asked to come and meet them by Paris Saint-Germain. They met and talked about positions and contracts and there was a positive response. The two Kylian Mbappe are quite good friends.