Real Madrid goalkeeper Iker Casillas could be sidelined for up to three months after successfully undergoing surgery on a broken bone in his left hand. The Spain captain went under the knife during an hour-long operation in Madrid today after suffering the injury during Wednesday\'s Copa del Rey quarter-final clash with Valencia. Doctor Miguel del Cerro, who performed the operation, said in AS: \"The operation has gone very well. He will be out for between eight to 12 weeks.\" Madrid medical chief Carlos Diez said in a statement on his club\'s website: \"Everything has been phenomenal. Two screws were put in and the hand has been perfect. It has been a complete success from a surgical point of view.\" Casillas will now miss the Copa del Rey semi-final double-header against Barcelona, the UEFA Champions League last-16 tie with Manchester United and a host of La Liga matches. Antonio Adan, who has been controversially picked by coach Jose Mourinho ahead of Casillas in a handful of recent matches, is the frontrunner to replace the world and European champion although Madrid are reportedly in the market for a new goalkeeper to cover Casillas\' loss. From FIFA