Northern Ireland midfielder Paul Paton has been linked with Pompey.
According to the Daily Record, Paul Paton is currently training with the Blues.
The combative midfielder is a free agent following his January 31 release by Scottish Premiership side St Johnstone.
The 30-year-old has this season made 19 appearances for the Saints before his two-year deal was cancelled six months early.
Paton has also turned out four times for Northern Ireland, despite born in Paisley.