Anthony Davis won't play football in 2015 despite being just 25 years old.

With Pro Bowl guard Mike Iupati defecting to the Cardinals, the 49ers have lost both of their first-round picks from the 2010 NFL Draft.

"After a few years of thought, I've decided it will be best for me to take a year or so away from the NFL. This will be a time for me to allow my Brain and Body a chance to heal. I know many won't understand my decision, that's ok.

"I hope you too have the courage to live your life how you planned it when day dreaming to yourself growing up. Your Life is Your dream and you have the power to control that dream. I'm simply doing what's best for my body as well as my mental health at this time in my life."

Although the wording suggests a sabbatical, a statement released by the 49ers reads that Davis has "informed the team he plans to retire" from the NFL.

Davis missed four games last season following a concussion.