SAN FRANCISCO, CA (The Spread) - Right tackle Anthony Davis became the latest 49er to abruptly retire when he announced his decision Friday.

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Davis joins linebackers Patrick Willis and Chris Borland, as well as defensive end Justin Smith to retire ahead of San Francisco's 2015 season. Smith's announcement was somewhat expected, but Willis, Borland and Davis' decisions came as complete shocks outside of San Francisco.

Davis tweeted Friday that he plans to return to football "in a year or so." Wrote the 26-year-old: "I'll be 26 or 27 years old. I'm taking this time to allow my Brain and Body time to heal and recoup."

According to oddsmakers from online sports book, the 49ers are 40/1 long shots to win the 2016 Super Bowl. Replacing Davis won't be easy, as seventh-round pick Trent Brown, Bills castoff Erik Pears and right guard Alex Boone will vie for the open position at right tackle.

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