Denver Hume had been at Sunderland since he was a child, progressing through the academy and breaking into the first team.
But the left-sided player has now travelled the length of the country to complete a switch to Pompey.
He has experience of competing at Fratton Park as a member of the Black Cats side and admitted it was a daunting experience.
So now the 23-year-old is eager to have the Blues faithful on his side and try to bring success to his new club.
Hume said: “I’m delighted to be here. We’ve got the deal over the line and now I’m looking to kick on.
“I first heard of the interest a couple of weeks ago, although you don’t know how concrete that is and just carry on as normal.
“It started to get stronger and then I spoke to the manager for the first time last week. He expressed that he wanted me here and my mind was made up from that point.
"You can’t really get much different in terms of going from that far north to this far south! It’s a big step, but I think the change will be good for me."
“I was at Sunderland for a long time and have a lot of good memories after coming up through the academy, but I think this is a good opportunity to get back to play and enjoying my football.
“You can’t really get much different in terms of going from that far north to this far south! It’s a big step, but I think the change will be good for me.
“That can really help me focus and get down to the main thing – which is obviously playing football games.
“I’ve appeared at Fratton Park for the away side and it’s a hard place to go. It’s a ground you don’t look forward to visiting. To be there as a home player, though, is something I’m looking forward to.
“I’ll always give 100 per cent for the shirt and do everything to help this club be successful. We want to win as many games as possible this season.”
Pompey have utilised both a 4-2-3-1 and 3-4-1-2 system this season and Hume is comfortable fitting into either.
He said: “A lot of my career has been spent as a left wing-back or left-back. The first thing is to defend, but I also like to get forward and help the team score goals.”