[2][3] His brace against Fair Point on the final day of the league secured the Division One Zone III title and sealed their qualification.

[6][7] In September 2010, he moved to Tunisian club Esperance Sportive de Tunis on a 4-month loan deal worth $150,000.

However he had the opportunity of winning a silver medal when ES Tunis lost the 2010 CAF Champions league final to TP Mazembe in late 2010.

Mahatma Otoo returned to Hearts of Oak in the second round of the 2010–11 season, help the club finish 10th in the league.

[13] Otoo scored a hat-trick against Tema Youth on the final game of the season and win the top scorer of Ghana Premier League with 20 goals.

He was a top goalscorer of the tournament with 4 goals in 4 games helping Ghana to gold by scoring South Africa in the final.

[27][28] In March 2013, Otoo was called up to the Ghana national football team by coach Kwesi Appiah.

Two days after her death, Otoo scored a goal in a match against Adanaspor and was seen crying and raising his hands to the skies and later going down in celebration whilst his teammates surrounded him to console him.

He posted “I dedicate today’s goal to my mum, May Her Soul Rest In Peace.”[35][36] St. Mirren ES Tunis Sogndal Ghana U23 Individual