Yes Manchester United’s failure to win any silverware and finishing 15th on the league table this season will have a huge impact on their chances of getting the preferred number of signings they would have loved to get this summer. I read Manchester United want to overhaul their current squad which I think is a good idea because most of the players are underperforming but I wonder how the club plans on attracting top players to their side.
You are right, Manchester United position in the Premier League could stop them from signing any top player they want since no player wants to play for a team that is struggling with its games, especially when they will not compete in any European competitions. Many players have rejected the team offer because they will not participate in the Champions League next season, if they had made it to the Champions League, many players would not have considered where they ended up this season but no other league to play aside from the Premier League.
However, Mathew Cunha accepted the club offer from Wolves, becoming Amorim first signing, the player didn't care whether the team just played in the Premier League, he accepted the deal. While many individuals assume he joined Manchester United since his previous club only played in the Premier League and survived relegation, he accepted Manchester United offer in hopes that he might play in another competition, perhaps in the next two seasons.