Head coach of Ghanaian top flight side Hearts of Oak David Duncan has revealed that he is not happy at the club and says it is possible he might leave at the end of the season.Speculations of his resignation at the end of the season are rife in the local media and speaking to Asempa FM's Kofi Asare Brako on the ultimate sports show, the former Ghana national U-23 coach did not rule that out."I am at the apex of my coaching career domestically and coaching Accra Hearts of Oak is the highest point," Duncan said."I am having some challenges but I am not the type of person who suffers in silence. I let it out and to anybody who has the right to know and the people who have the right to know are not only my employers."I let anyone who asks me about my job know the truth. I am not a hypocrite to say I am happy if I am not."I express my frustrations, my challenges and if things continue this way, we might not meet the target we have set for ourselves and I don't want to be held responsible for it and if push comes to shove, I will do the honorable thing."Duncan's performance has earned rave reviews after taking the club from a relegation position to compete for a top four finish.