The steps were part of a sweeping move by S&P for multiple lenders in Germany and elsewhere, and follow a similar effort by Fitch, another credit rating agency, last month.

"We expect bank earnings, asset quality, and in some cases, capitalization, to weaken meaningfully through year-end 2020 and into 2021," S&P said in a statement.

S&P, which expects a "severe" recession in Germany this year, said of Commerzbank that it would "become increasingly challenging for it to deliver on its essential multi-year restructuring".

S&P said Deutsche's restructuring was "fundamentally on track" but acknowledged "substantial downside risks".

Both banks, which are now rated BBB+ with a negative outlook, declined to comment.

(Reporting by Tom Sims, Hans Seidenstuecker and Patricia Uhlig; Editing by Chizu Nomiyama)