Prime Minister David Cameron has discussed the eurozone debt crisis with French President Nicolas Sarkozy.The Paris talks came ahead of a crucial meeting of European leaders next week about the future shape of the EU.Mr Sarkozy has said a new treaty is needed to impose financial discipline on countries using the single currency.But Mr Cameron said steps could be taken to shore up the euro and improve the competitiveness of its weaker economies without treaty change.Britain is not in the eurozone but is concerned a reorganisation could marginalise its influence in the EU.The two leaders discussed plans to reorganise the governance of the eurozone, which will see closer co-operation within the 17-strong bloc, potentially reducing Britain's influence.The move will be considered by the European Council at the end of next week, but Germany and France will agree a plan of action on Monday.Any reforms of the Maastricht Treaty rules governing the eurozone will have to be agreed by all 27 members of the European Union.