Deutsche Bank AG and Commerzbank AG will have a tough time convincing regulators a merged bank would not pose too much systemic risk, should they decide to pursue a tie-up, according to regulation experts and analysts.

Germany’s two biggest privately held banks have both struggled in the aftermath of the global financial crisis, and a merger has been mooted as a possible solution. But regulatory warnings about threats to financial stability started to pile in just a day after the firms launched exploratory talks.

Read more