Alex Bass has left Pompey to sign for Sunderland for an undisclosed fee.
The 24-year-old goalkeeper made 41 senior appearances for the Blues, having progressed through the academy.
He made his debut in a narrow Carabao Cup defeat at Coventry in August 2016 before keeping a clean sheet on his victorious league debut against Peterborough a couple of years later.
Bass spent the second half of last season on loan at Bradford and previous had temporary spells with Salisbury, Torquay and Southend.
Everyone at Portsmouth Football Club would like to thank Alex for his contribution to the club and we wish him well for the future.