Pompey have signed George Hirst on a season-long loan deal from Premier League side Leicester.
The 22-year-old forward has represented England up to under-20 level and was part of the side that won the Toulon Tournament in 2017, being named in the competition's 'Best XI'.
Blues boss Danny Cowley said: “George is still a really young boy, but it feels as though he’s been around forever.
“He played for Leicester’s feeder club in Belgium before signing for them and we’ve followed his career closely.
“He didn’t have it all his own way at Rotherham last season. He didn’t play as much as he would have liked and it probably wasn’t the right fit for either party.
“Sometimes that happens in football, but we like to sign players who have got a point to prove and we see a real hunger and desire to succeed in George.
“When you don’t have everything your own way, it can really motivate you. We certainly believe in his abilities.
"we like to sign players who have got a point to prove and we see a real hunger and desire to succeed in George."
“He fits our game idea, loves to run and has a real athleticism and intensity to his play, while he can bring others into his play and is a real team player.
“We want to showcase an aggressive, high intensity style and need our number nine to have those qualities.
“He’s got a lovely right foot and is a good finisher. We believe we can create the chances that George needs to score goals regularly.
“There’s real potential there and we’ve got a lot of confidence in him – both as a player and as a person.
Hirst progressed through the ranks at Sheffield Wednesday – where father David made more than 350 appearances – before joining Belgian side Leuven in the summer of 2018.
He moved to Leicester a year later and has featured twice for them in the Premier League, coming off the bench in games at Tottenham and Manchester United.
Hirst spent the whole of last season on loan at Championship side Rotherham, where he made 32 appearances.