Iran's Opec governor has said that Opec may not necessarily boost output if oil demand rises, as producers outside the group could increase their production, Reuters has reported. 'Opec must consider the increase in crude oil output by non-Opec countries before making any decision regarding the stability of the global oil market,' Mohammad Ali Khatibi was quoted as saying. 'Any rise in the demand for oil in the wake of improvement in the global economic situation would not necessarily mean that Opec will raise its output ceiling as non-Opec producers could increase their production.'