Portsmouth have signed goalkeeper Will Norris, defender Conor Shaughnessy and forward Christian Saydee.
Norris, 29, has agreed a three-year deal at Fratton Park after being released by Burnley last month.
Irishman Shaughnessy, 26, joins from Burton Albion on a two-year deal, with an option for a further 12 months.
Saydee, 21, has signed a three-year deal for an undisclosed fee from Bournemouth, having scored seven goals on loan at Shrewsbury last season.
Norris played just three times for Burnley after joining from Wolves in the summer of 2020 and spent the first half of this year on loan at Peterborough.