Andy Murray plans to skip next month's Davis Cup Finals because he is "not sure he deserves to play in that team".
Murray, 34, was knocked out of the Indian Wells Masters in the third round on Tuesday night in a 6-4 7-6 (7-4) defeat by Alexander Zverev.
He won 11 points out of a possible 12 to help Great Britain win the Davis Cup for the first time in 79 years in 2015.
"I've given a lot to the Davis Cup, and sometimes to my own detriment physically," he told BBC Sport.
"The same thing happened last time I played Davis Cup at the end of 2019.