Madrid - Real Madrid will be without veteran midfielder Guti for around a month, the troubled Spanish giants announced on Friday.

Guti, 32, has torn the cuadriceps muscle in his left leg, according to the club doctors.

He has not played since December 20 and will not be out until the middle of February. Thus he is doubtful for Real's Champions League round of 16 clash against Premier League leaders Liverpool.

The injury to Guti will open the door for new signing Lassana Diarra to establish himself in the Real midfield.

In addition, reserve goalkeeper Jerzy Dudek has torn a muscle in his right calf and will be out for around three weeks.

Also on Friday, Ramon Calderon resigned as Real president, as a consequence of the allegations made by sports daily Marca that he had allowed unqualified delegates to vote at the club's annual general assembly on December 7. (dpa)