With this weekend's Premier League clash against Leeds postponed and then a pause for international fixtures, United do not have a game until their derby trip to Manchester City on October 2.
United signed off for the period with a comfortable 2-0 victory over Sheriff Tiraspol in their Europa League group in Moldova on Thursday.
"Always you use breaks," said Ten Hag, whose side had won four successive Premier League games prior to the postponement of last week's fixture at Crystal Palace following the death of the Queen.
"We have many meetings, we have to improve the structures in and around the club. We will do.
"We will also look to the window in January or next summer already and also to improve our way of playing by making plans."
The City game will be the first of 13 fixtures in the space of 43 days for United before top-level domestic football closes down for the World Cup.
Ten Hag added on MUTV: "Of course, it's coming, a period with a game every third day and we have to get ready for that.
"The players, 90 per cent are away, but the others we will train properly. We have to prepare very well.
"Then I hope that everyone stays fit, returns back healthy and then we have to get in to attack."