Madrid  - Real Madrid president Ramon Calderon on Friday officially resigned over an affair involving unqualified delegates at the club's last board meeting.

Calderon made the announcement at a news conference at Real's Bernabeu stadium, confirming news reports from earlier in the day.

Vice-president Vicente Boluda will take over as interim president until elections can be organized.

Calderon was under massive pressure to quit when a news report earlier in the week said that he had sneaked unqualified delegates into the club's annual general assembly on December 7, in order to have his proposed budget and other measures passed. (dpa)