Date of birth
Pompey paid an undisclosed fee to sign Harrison from Ipswich ahead of the 2019/20 season.
The striker – who has represented his country up to under-21 level – began his career with Bristol Rovers.
He made more than 200 appearances during his time at the Memorial Stadium and scored at Wembley as they won the Conference Premier play-offs in 2015.
Harrison then played another crucial role the following season as Rovers secured back-to-back promotions.
He moved to Ipswich in 2018 and opened his account in a 1-1 Championship draw with Sheffield United.
Harrison's first goals in a Blues shirt arrived in hus second appearance, with a brace helping to shock Birmingham in the EFL Cup.