Portsmouth
Kanu was a free agent following his departure from West Brom, and he signed for Portsmouth on a one-year deal shortly before the start of the 2006–07 season. Pompey had undergone a revival in the second half of the previous campaign, following the return of Harry Redknapp as manager, avoiding relegation by four points after being in serious danger at the turn of the year. At the start of the 2006–07 season, they were undefeated in their first five games, during which they did not concede a single goal. Kanu made his debut for Portsmouth as a substitute against Blackburn Rovers on 19 August 2006, the opening day of the 2006–2007 Premier League season. He scored twice and missed a penalty. Though Kanu led the top scorers chart early in the season, he had a goal drought for the rest of the season, but still finished as the top goalscorer for Portsmouth, with 12 goals.
In his second season at Portsmouth, Kanu scored in both the FA Cup 1–0 semi-final win against West Bromwich Albion and the 1–0 win in the final against Cardiff City, earning him a third FA Cup winner's medal.
His first goal of the 2008–09 season put Portsmouth 2–0 up in their eventual 2–2 UEFA Cup draw with Italian club A.C. Milan. He later scored the winning goal against Bolton Wanderers, which ensured Pompey's mathematical safety. It was his only Premier League goal of 2008–2009. He re-signed with Pompey in August 2010, with an eye on becoming a coach when he retired. Kanu signed a three-year deal and kept the number 27 shirt, but was not a regular starter throughout the course of the season and only managed two goals.
During the 2011–12 season, his playing time was reduced, appearing only from the bench. After the departure of Steve Cotterill, and the arrival of Michael Appleton, he was also removed from the bench, due to fitness and injury problems. By May 2012, aided by a point deduction for entering administration Portsmouth had found themselves in a relegation battle which eventually ended in them relegated to Football League One. To cut costs the Administrator hopes to reach agreement to terminate the contracts of Kanu along with six other players due to them being the highest-earning players at the club. On 9 July 2012, it was announced that Kanu and Aaron Mokoena were expected to leave the club after failing to attend the first day back at pre-season training On 13 July 2012, Kanu says he going to sue Portsmouth, claiming up to £3m in periods of unpaid wages since 2006. It was announced on 30 July, that Kanu had agreed to leave Portsmouth, but that he was still in a dispute over wages that had been unpaid by the Hampshire club.
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