Portsmouth have finalised the signing of Nigeria international striker Kanu.
Kanu is a free agent after his contract at West Brom ended
The 30-year-old forward, who was released by West Bromwich Albion at the end of last season, has agreed a one-year deal with Portsmouth.
Kanu is manager Harry Redknapp's fifth signing of the summer.
Former Arsenal and Ajax striker Kanu has also been interesting Hamburg, but he has snubbed Champions League football to stay in the Premiership.
The Nigeria international first moved to England in 1999 when he joined Arsenal from Inter Milan for £4.5m.
Kanu was part of Arsenal's double-winning side of 2001-02 and gained another Premier League medal in 2004.
He scored 30 league goals in just 63 starts for the Gunners before securing a free transfer to West Brom in 2004.
But he managed just nine goals for the Baggies in two seasons.
Chelsea right-back Glen Johnson, former Arsenal centre-half Sol Campbell, ex-Blackburn and Wigan midfielder David Thompson, and former Manchester City goalkeeper David James are Redknapp's other signings during the close season.
And the Portsmouth manager expects to buy more players before the transfer deadline.
"It is the smallest squad I've ever had at the start of a season," said Redknapp.
"We are still at least four players short and a run of injuries would be very bad news for us.
"We've tried for a long list of big signings and the owner has been ready to put up the money for them.
"But other clubs just don't want to sell their good players and it has been a frustrating time.
"But we still have two weeks before the transfer deadline to put that right and we are still looking to do that.
"There is no way we can afford to wait until January the next deadline."