After admitting there is a lot of work to be done at Old Trafford, ten Hag suggested he will begin work on Monday.
After leading them to the Eredivisie title, Ten Hag took charge of his final game as Ajax boss on Sunday with a 2-2 draw at Vitesse.
After the game, he said he would not be part of the post-season trip to Curacao as he focused on the United job.
There will be a party for the entire staff on Monday, but that will be it.
I will not be going to Curacao with them. I think that is understandable.
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There is a lot of work to be done at United. Absolutely. There is a lot of work at every club. A manager is focused on preparing for next season. There is a lot of work to be done.
There are several things that need to be organised for the staff. We will be focusing on the team over the next several days, as of tomorrow.
Mitchell van der Gaag is an assistant to the Dutch coach and Steve McClaren was an assistant to Sir Alex Ferguson at United.
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If United win at Crystal Palace on the final day of the season, they will be guaranteed a place in the Europa League.
The interim boss, who was appointed Austria manager last month, is set to move into a consulting role at United.
Ten Hag, who signed a three-year deal at United which can be extended by a year, will become the club's fifth permanent manager since Sir Alex Ferguson retired.
Ten Hag held a meeting with Manchester United football director John Murtough in Amsterdam on Thursday as he began to plan his new team's revival.
On the same day that Ten Hag oversaw a win for Ajax in the Eredivisie title, Murtough watched United win the FA Youth Cup.
Murtough flew out to Amsterdam to see the man. After the appointment, intensive discussions over transfers and strategy were put on hold until the title was won.
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It has been reported that ex-England boss and former United coach Steve McClaren and his current assistant Mitchell van der Gaag were in attendance.
Alfred Schreuder, who was an assistant to Ten Hag at the Dutch side, will take over as head coach at Ajax this summer.
Manchester United are interested in signing Frenkie de Jong, but no deal is imminent.
Ten Hag worked with De Jong.
The Dutch international moved to Barcelona in a 75 million dollar deal after helping Ajax reach the semi-finals of the European Championship.
The United are expected to sign at least one player in the middle of the field this summer.
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Barcelona's financial problems may mean they are willing to sell De Jong this summer.
The failure to qualify for the playoffs will count against United if Barcelona decide to sell.