The Dutchman is now one of the frontrunners to succeed interim manager Ralf Rangnick at the end of the season, as he seeks an agreement from the Old Trafford leadership.
Ten Hag may have to wow the United board a second time with an additional interview arranged before he may eventually get that.
Manchester United are believed to have met with Ten Hag two weeks ago, during which the Ajax boss delighted them with his thorough ideology.
However, Mauricio Pochettino is still a contender, and there are now worries about Ten Hag's ability to persuade the United board.
The Red Devils were wary of Ten Hag's belief that this is a five-year project, according to The Independent.