Barclays is reportedly drafting in JPMorgan Cazenove to help steer it through an intensive period of restructuring to improve its performance.According to Sky News, Barclays has in recent days appointed the Wall Street bank as its corporate broker, alongside Deutsche Bank, an incumbent.JPMorgan will replace Credit Suisse in a move which is understood to have been heavily influence by Barclays' new chairman John McFarlane.News of JPMorgan's appointment by Barclays comes days after Sky News revealed that Goldman Sachs had replaced its Wall Street rival as the privatisation adviser to the UK Government.