|Full name||Isaac Great Success Ajayi|
|Date of birth||7 January 1996|
|Place of birth||Benin City, Nigeria|
|Height||1.82 m (5 ft 11 1⁄2 in)|
|2018||→ Málaga (loan)||8||(0)|
* Senior club appearances and goals counted for the domestic league only and correct as of 17:31, 2 September 2018 (UTC)|
‡ National team caps and goals correct as of 24 March 2017
In November 2013 Success agreed to a five-year deal with Udinese, starting January 2014, for a €400,000 fee. However, he was only granted a work permit in March of the following year, and immediately joined Granada CF, being assigned to the reserves in Segunda División B.
On 31 August 2014 Success made his first-team debut, starting in a 1–1 away draw against Elche CF at the age of 18 years and seven months, being the Andalusians' youngest player ever to appear in a La Liga match. He scored his first professional goal on 7 December, netting his side's only of a home draw against Valencia CF, for the same scoreline. On 7 August 2015 Success extended his link with the club, signing until 2019 and being permanently promoted to the main squad.
On 1 July 2016, Success agreed a five-year deal with Watford in a record transfer fee, estimated around £12.5 million from Granada. Success scored once in 19 appearances in the 2016-17 season and, after just one appearance in 2017-18 was loaned to Malaga on 31 January 2018.
In 2013 Success was called up to Nigeria under-17's for the year's FIFA U-17 World Cup, being also named vice-captain. He appeared in the first two games, but was sidelined during the rest of the tournament due to an injury. Success got his first call up to the senior Nigeria side for a 2018 FIFA World Cup qualifier against Zambia in October 2016. On 23 March 2017, Success made his debut for Nigeria, coming on as a substitute in a 1–1 draw against Senegal at The Hive Stadium in London.
- As of 2 September 2018
|Granada B||2013–14||Segunda División B||5||3||—||—||5||3|
|2014–15||Segunda División B||15||6||—||—||15||6|
- "Squads for 2016/17 Premier League confirmed". Premier League. 1 September 2016. Retrieved 11 September 2016.
- Eaglets Striker Close To Udinese Deal; Complete Sports Nigeria, 10 June 2013
- Isaac Success Confirms He Will Join Udinese In January; All Nigeria Soccer, 12 November 2013
- Isaac Success, la nuova scommessa dell'Udinese (Isaac Success, Udinese's new bet); Tutto Udinese, 26 May 2013 (in Italian)
- Isaac Success gets work permit today; The Nation Online, 14 March 2014
- Success Isaac y Uche Agbo: nuevos jugadores del Granada CF (Success Isaac and Uche Agbo: new player of Granada CF) Archived 2014-09-03 at the Wayback Machine.; Granada's official website, 18 March 2014 (in Spanish)
- Elche snatch last-gasp equalsier; ESPN FC, 31 August 2014
- Success, jugador más joven en debutar en Primera con el Granada (Success, the youngest player to debut in Primera with Granada); Marca, 1 September 2014 (in Spanish)
- Granada 1–1 Valencia; ESPN FC, 7 December 2014
- Isaac Success un año más de contrato (Isaac Success one more year of contract)[permanent dead link]; Granada's official website, 7 August 2015 (in Spanish)
- "Official: Isaac Success joins Watford FC". Watford F.C. Club Journalist. Retrieved 1 July 2016.
- Watford: Isaac Success joins Malaga on loan, BBC News, 31 January 2018
- Isaac Success fit for U-17 World Cup final; Goal.com, 8 November 2013
- "Mikel Obi, Musa, Ikeme 20 others To battle Zambia". thenff.com. 22 September 2016. Retrieved 5 October 2016.
- "Nigeria 1 Senegal 1: Iheanacho earns a draw for Super Eagles". Goal. Retrieved 24 March 2017.
- "I. SUCCESS". Soccerway. Retrieved 9 July 2016.
- "Games played by Isaac Success in 2018/2019". Soccerbase. Centurycomm. Retrieved 19 August 2018.