|Date of birth||2 December 1987|
|Place of birth||Zaria, Nigeria|
|Height||1.83 m (6 ft 0 in)|
|Giresunspor (on loan from Karabükspor)|
|2009–2010||→ Manisaspor (loan)||27||(6)|
|2017–||→ Giresunspor (loan)||2||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 13 September 2014.
‡ National team caps and goals correct as of 13 September 2009
As a promising youngster, Promise went on trials with Nigerian second division side Grays International. Attracting attention from several big name football clubs in Europe, he went on trials with Manchester United alongside John Obi Mikel, but found the trials unsuccessful. After being linked with Dutch outfit Feyenoord Rotterdam he eventually signed for Turkcell Süper Lig club Genclerbirligi in a three-year deal in August 2005.
In the Turkcell Super League 2006-07 season Promise scored 12 goals. He more than doubled the number of his total goals for Gençlerbirliği. On 15 July 2008, Isaac agreed a 4-year deal with Trabzonspor.
With Trabzonspor, he scored two goals in 26 matches. Because of his average performance he was loaned out to Manisaspor for a year. Isaac played 27 matches and scored six goals. In the summer of 2010, Manisaspor signed a contract with Isaac. After scoring 11 goals in 30 matches with his now relegated club Manisaspor, he signed a 3-year contract with Antalyaspor.
Isaac was named as the captain of Nigeria squad for the 2008 Summer Olympics. On 13 August 2008 at Tianjin Olympic Centre Stadium of China, Promise scored Nigeria's first goal against USA in the preliminary stage, Nigeria went ahead to win the match by 2–1.
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