Harrison, who signed on deadline day, admits that he got goosebumps watching the team play at St James' Park.
"I'm buzzing to join such a big club in Newcastle United with such a big fanbase," Harrison told the club's programme.
"Everyone in Newcastle is so passionate about their football and I can see a good pathway for myself if I keep working hard and pushing on.
"The interest that the club have shown in me was a really big factor in wanting to make the move and I really like the place. I've been to St James' Park already and I admit it did take me back a bit.
"I went to the game against Luton where we drew 4-4 and the atmosphere inside the stadium was unbelievable. It really surprised me at how good it was and I was getting goosebumps just thinking what it would be like to be out there on the pitch myself."