Hugill has put pen to paper on a four-and-a-year contract for an undisclosed fee.
“I'm absolutely delighted!" said Hugill, who will wear the No12 shirt. "It's been a long day, but to get this over the line is amazing for me and it's now a new challenge for me and hopefully I can bring what I did at Preston here and show what I can do. We got on the train at lunchtime and I couldn't tell you what happened, it's all been a blur!
"It's amazing to know I'm a Premier League footballer, to know where I've come from in the last five years to where I am now in the Premier League is amazing. I'm still pinching myself to see if it's all real, but hopefully I can bring my qualities from Preston here to West Ham. Without a doubt it's a huge opportunity and I'm looking forward to it.
"Wherever I have been in life, not just in football, but in whatever I do, I give everything. I'm going to give absolutely everything for this Club and for my teammates. It's a new challenge for me, playing in the Premier League, but they are going to get nothing less than 100 per cent.
"I know a lot about West Ham and its history. Upton Park spoke for itself and now the big move here which was a brilliant thing. The one thing that has struck me about watching West Ham over the years is the fan base that we've got. It's amazing how good the fans are here, so I'm looking forward to walking out at London Stadium and hearing the old Bubbles!"