March 27 (Reuters) - Discover Financial Services ( DFS )

said on Wednesday its CEO Michael Rhodes will step down from his

role, effective April 1, three months after he joined the credit

card issuer.

Rhodes will serve as an advisor to Discover's interim CEO J.

Michael Shepherd through April 12, and will take over the helm

as Ally Financial's ( ALLY ) top boss from April 29.

Shepherd, who was appointed on March 26, will continue to

serve as a director, but will resign as a member of the board's

risk oversight committee.

Rhodes was not expected to have a long-term role after the

company completed its merger with Capital One Financial ( COF ),

Discover said in the filing.

Last month, Warren Buffett-backed U.S. consumer bank Capital

One and U.S. credit card issuer Discover unveiled plans of a

$35.3 billion deal to create a global payments giant that is

expected to receive intense antitrust scrutiny.