New York leaders Shearman & Sterling and Sullivan & Cromwell have bagged top roles on insurance giant Allianz's €9.8bn (£7.9bn) sale of Dresdner Bank to German rival Commerzbank.

Shearman is advising Allianz on the deal fielding a team including Duesseldorf-based co-managing partner Georg Thoma.

The US firm's German arm has close links with Allianz and advised on its takeover of Dresdner in 2001. Thoma has also worked on deals including Shearman's 2005 acquisition of the outstanding 45% stake in Italian insurer Riunione Adriatica di Sicurta.