After four-and-a-half years with Auroras FC Otoo left the club to sign on 11 June 2008 for Accra Hearts of Oak SC.
[1] On 1 December 2009, Otoo joined Ghana Football Leagues club Red Bull Ghana prior to joining on 1 July 2010 Ghana Premier League club Wa All Stars in the 2010–2011 Ghanaian Premier League season.
[2] In January 2016, Otoo joined Armenian side Gandzasar Kapan, having previously agreed a deal with Hearts of Oak.
[3] Otoo's first call-up in the Ghana national football team for a friendly match against Argentina national football team,[4] and Otoo earned his debut in the match on 1 October 2009.
[5] Otoo was included in the Ghana preliminary team for the 2014 African Nations Championship, and finished as runner-up.