Meulensteen admits he's concerned with the start made to Ten Hag's tenure.
“It is a bit of a worry to be fairly honest, if you look again at how Liverpool and Manchester City have done the business with Nunez and Haaland, they've strengthened themselves," Meulensteen told talkSPORT. “United has got far more work to do than that, it is a massive step up.
“First of all, he needs to buy in to his ideas, the way of work because there's some issues there over the last season or so, he needs to sort that out and he needs to hit the ground running. You want to get players through the door, you want to get fans the fans excited and the message to him throughout the media is going to be important because, like we always said, they're just sliding and sliding.
“If I don't see real quality coming through the door and Ten Hag has to do it with a similar sort of squad to last year with obvious players who have left the club it will be a big, big challenge."