Pompey have completed a second swoop of the day with the signing of Paul Downing.
The centre-back has moved to Fratton Park on a free transfer following his release from Blackburn Rovers.
Downing has penned a three-year deal will officially become a Blues player on July 1.
He’s the second new arrival today after Ellis Harrison joined from Ipswich for an undiclosed fee.
Doncaster were keen to sign Downing on a permanent basis after he spent the second half of the season on loan at the Keepmoat Stadium.