Black Satellites striker Mahatma Otoo has told Joy Sports he is unperturbed about his return to Hearts of Oak after his permanent move to Esperance hit the rocks.The 18-year-old is now on loan at the Tunisian club after they failed to reach an agreement with Hearts of Oak to sign the 18-year-old on a permanent deal.The North African side could not complete the signing of Otoo due to financial challenges. Otoo is expected to return to the Phobian club after his loan deal expires on December 31.Mahatma Otoo is keen on maximizing opportunities at Esperance and believes improving his performance at the club could also earn him a call-up to the Black Stars.Source: Joy Sports/Ghana