This would help its investment bankers in their pitches to clients, especially for IPOs, one of the sources added.
Klein is selling his business to Credit Suisse for $175 million, the two said earlier this month.
Credit Suisse will focus on managing money for the wealthy after the carve-out.
A spokesman for Credit Suisse declined to comment, as did a representative for Klein.
Credit Suisse reported its biggest annual loss last year since the financial crisis and cut its bonus pool by 50% for 2022.