Date of birth
The Leicester striker moved to Fratton Park on a season-long loan deal in August 2021.
He 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'.
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.