European Union policymakers should "take the same view" as their US counterparts on banking sector reforms or risk stifling growth in the bloc, according to senior figures at two banks in the region.

Séverin Cabannes, the deputy chief executive officer of Societe Generale, warned that if the US chose not to implement post-crisis bank capital rules known as Basel III and Europe decided the opposite, there "will be a real gap" and an "unlevel playing field" between the two.