Pompey are close to signing free agent Kelvin Etuhu.
The Blues are hopeful of bringing the winger in for this weekend’s clash with Cardiff.
He trained with the squad this morning but, despite reports, the 23-year-old has yet to complete his move to Fratton Park.
Etuhu was released by Manchester City in March following a jail term for assault.
During his five-year spell at the Premier League club, the Nigeria-born player spent periods on loan at Rochdale, Leicester City and Cardiff City.
He appeared as a substitute for the Bluebirds in their 2010 Championship play-off defeat at the hands of Blackpool.
Michael Appleton has admitted he is today hoping to unveil a replacement for Hermann Hreidarsson, who left for Coventry City earlier this week.
Pompey have also been linked with loan moves for Manchester City youngsters Joan Angel Roman and Abdul Razak.
Razak made three appearances for the Blues during a temporary spell at Fratton Park earlier this term.
However, the Football League are monitoring Pompey’s transfer market dealings and have instructed they must operate with a one-out, one-in policy.
Etuhu’s arrival would take Appleton’s squad to 20 players - still the smallest in the Football League.