Williamson has impressed for the Valiants during the early part of pre-season, and Hughes has insisted that the 24-year-old forward has a "massive future" in front of him.
The 37-year-old told The Sentinel: "Ben's a very talented lad who's improving all the time.
"I see a lot of potential in him and I'm sure that he can go a lot higher than League One.
"He's someone who has everything a good striker needs. He has terrific pace, he's really powerful, his movement is great and he has awareness too – he has a massive future ahead of him."
The former Millwall trainee netted nine goals in 39 appearances for Vale last season.