Striker Kanu has signed a one-month deal with Portsmouth.
The Nigerian's contract with the south-coast club expired at the end of last season and he is now staying on a short-term basis.
Kanu joined Portsmouth on a free transfer from West Brom in August 2006 and has scored 21 goals in 94 appearances while at Fratton Park.
The 33-year-old's decision to stay will help Pompey boss Paul Hart after a number of players left this summer.
The club's financial situation is not helping Hart because the club remain in the midst of a protracted takeover by United Arab Emirates businessman Sulaiman Al Fahim.
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