The Cameroon defender has insisted that his sole focus is on rectifying the dire situation the Stade Velodrome outfit find themselves in amid rumours of interest from Barcelona.Nicolas Nkoulou has declared that he is happy at Marseille and is not looking to move elsewhere.The Cameroon international has been linked in recent weeks with Barcelona, but was keen to stress that he wants to focus on turning around OM\'s miserable run of results since the turn of the year.\"I am well at OM and I want to stay,\" the 22-year-old told Canal+. \"It has been difficult to progress [with the club], but you should try to take advantage of these difficulties.\"I\'ll look at what will be good for me but what concerns me the most is the situation at OM,\" he insisted.Didier Deschamps\' side have endured a terrible run of form that has seen them go winless in the league since January.Despite success in the Coupe de la Ligue, the club have fallen out of the running for Champions League qualification next season.Nkoulou joined Marseille from Monaco on a four-year contract last summer and has since become a mainstay in the first team.