Aiden O'Brien says he was 'itching to sign' for Portsmouth on deadline day after dropping down the pecking order at Sunderland.
The forward joined the Black Cats' League One rivals on Monday evening, with Sunderland sporting director Kristjaan Speakman saying O'Brien was keen to move on in search of regular first team football.
He had been a bit-part player under recently departed head coach Lee Johnson in the first two-thirds of the season, scoring two league goals in 17 appearances, only seven of which were starts.
