Defender arrives from Accrington
Pompey have signed versatile full-back Adam Buxton on an initial one-year deal.
The 24-year-old – who turned down the offer of a new contract at Accrington – has been handed the number 21 shirt.
Buxton came through the ranks at Wigan and had a spell on loan with Accrington before joining them permanently in the summer of 2014.
He scored two goals in 62 appearances during his time with Stanley and featured twice against the Blues last season.
He made 39 appearances for Accrington last season, scoring four goals.