As he arrived in London on Wednesday for meetings with club staff, ten Hag was able to get a head start on planning for next season.
Mitchell van der Gaag, who will be confirmed as one of his assistants at Old Trafford, was with the man when hejetted in on a private flight.
The pair will discuss recruitment and United's wide-ranging changes of operational structures at their Mayfair headquarters on Thursday.
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Ten Hag did not want to be a distraction ahead of the final game of the season at Crystal Palace on Sunday, and is not involved in any matchday planning.
He is expected to be at Selhurst Park.
Despite not officially starting work yet, Ten Hag has impressed their hierarchy with their energy and enthusiasm in wanting to get stuck in and steer United strongly ahead of the new campaign.
He has been described as authoritative and clear in how to implement his vision.
The appointments of van der Gaag and McClaren were made by Ten Hag, the latter who was an assistant to Sir Alex Ferguson at United.
Changes to the scouting department will give the incoming manager a bigger say in recruitment matters.
The new era at Manchester United must be addressed quickly by Ten Hag, who was chosen to lead the club.
As he prepares to tackle the mountainous task at Old Manchester, Ten Hag has forgone his plans to be part of the post-season trip.
Sky Sports takes a look at some of the key areas the Dutchman must fix at United as Ten Hag prepares to start his new role.
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