Regarding his new assignment for Manchester United, of course, I highly doubt he will be able to bring Manchester United to the peak of its glory, where currently there are many problems that must be resolved properly and gradually. His contract which is expected to run until 2025 will probably give him a chance to change some especially regarding the performance of the team and the players but regarding the pool question then I think it's definitely not. I really doubt it because the Eredevisie is a much lower ranked league than the Premier League.
Erik ten Hag's first season will definitely be a bit of a struggle, but the club and Manchester United supporters will have to be patient.
I do not doubt the capacity of the former Ajax Amsterdam coach during his tenure as the main coach of Manchester United because he will be assisted by an assistant who has memorized the Premier League system and character, namely Steve McClaren.