Date of birth
Pompey captured the midfielder in August 2021 following his departure from Norwich at the end of last season.
The former Wales under-21 international began his career at Swindon and his performances for the Robins earned a switch to Norwich in 2014.
He played 14 times for them and has had several spells out on loan, including at MK Dons last season.
Thompson’s older brother Nathan made 78 appearances during two campaigns with Pompey and was part of the side that lifted the EFL Trophy in 2019.