MADRID, Jan 29 (Reuters) - Spaniard Rafa Nadal will be out of action for two weeks because of a minor tear to a tendon in his right knee, doctor Angel Ruiz Cotorro said in a statement on Friday after completing a scan on the player in Barcelona.

The injury forced the 23-year-old to retire from his quarter-final against Andy Murray at the Australian Open on Tuesday.

(Writing by Mark Elkington; Editing by John Mehaffey; To query or comment on this story email sportsfeedback@thomsonreuters.com)