Davis is the fifth Niners player to retire this offseason, along with Justin Smith, Chris Borland, Patrick Willis and Bubba Ventrone, while the Niners are convinced that fifth-round draft pick Bradley Pinion is the answer at punter.
The 49ers' three-day mandatory minicamp runs Tuesday through Thursday.
Here is an updated look at the 49ers' offseason thus far:
RB Jarryd Hayne -- Australian rugby star chose the Niners, who he said gave him $100,000 guaranteed on a futures/reserve contract, over the Detroit Lions and Seattle Seahawks to begin his American football adventure and plans to play running back and special teams ... if he makes the squad.
DL Darnell Dockett -- Former Arizona Cardinals Pro Bowler stays in the division to fortify D-line, which will already be without Ray McDonald and possibly also Justin Smith, with two-year, $7.5 million contract.
WR Jerome Simpson -- Acrobatic wideout known for his forward somersault TD for Cincinnati and his legal issues signed to two-year deal.
WR Torrey Smith -- Five-year, $40 million contract with $22 million guaranteed brings big and fast deep threat who could be the yin to Anquan Boldin's yang ... like they were in Baltimore when the Ravens beat the Niners in Super Bowl XLVII.
RB Reggie Bush -- No. 2 pick of 2006 draft signs one-year contract to return to California as the San Diego native and USC product will be part of a three-headed Niners rushing attack, along with Carlos Hyde and Kendall Hunter ... and possibly rookie Mike Davis.
OL Erik Pears -- Eight-year NFL veteran who spent past five years with Buffalo Bills signs two-year deal, $4.7 million contract to compete for left guard spot (Pro Football Focus gave him a -25.0 grade last season, 76th of 78 guards) and/or at right tackle.
LB Nick Bellore -- Special teams ace who led New York Jets in special teams tackles in three of the past four years as an undrafted free agent out of Central Michigan. Has played in all 64 games since entering the league in 2011, though has yet to start one.
LB Patrick Willis -- Spiritual leader retires at age 30 after eight seasons, seven Pro Bowls and five All-Pro selections due to sore feet and a desire to move on.
FS Bubba Ventrone -- Retired to take job as assistant special teams coach with Super Bowl champion New England Patriots.
WR Stevie Johnson -- Released in cost-cutting move, signed three-year, $10.5 million deal with San Diego Chargers.
CB Chris Culliver -- Took his career-high four interceptions from 2014 and legal issues to Washington with a four-year deal worth up to $32 million.
LB Chris Borland -- Stunned Niners and NFL by announcing his retirement after one standout season, citing potential future health concerns.
CB Corey Fuller -- Waived after being signed to practice squad last December and being active for one game, though he did not play in the season finale.
QB Josh Johnson -- Despite having a skill set more closely resembling starter Colin Kaepernick's than that of Blaine Gabbert, Johnson was allowed to leave Santa Clara as he signed a one-year deal with the Cincinnati Bengals. Johnson spent the 2013 season with the Bengals.
WR Trindon Holliday -- Released by Niners. Later signed by Oakland Raiders.
G Fouimalo Fonoti -- Waived by Niners.
WR Lance Lewis -- Waived by Niners.
LB Chase Thomas -- Waived /injured by Niners.
DL Justin Smith -- The Cowboy said his left shoulder was done and if he could not play at the level he was accustomed to playing, it was time to move on.
RT Anthony Davis -- Announced his retirement on Friday, saying it was “time for me to allow my brain and body a chance to heal.”
P Andy Lee -- Traded to the Cleveland Browns on Saturday for a seventh-round selection in the 2017 draft.
QB Blaine Gabbert -- Lone Niners QB to throw a fourth-quarter TD last season agrees to two-year, $2 million deal to return as Colin Kaepernick's backup.
TE Garrett Celek -- Signed to a one-year deal.
LS Kyle Nelson -- Signed to four-year deal.
TE Derek Carrier -- Signed a two-year extension.
CB Chris Cook -- Re-signed to a one-year deal.
LB Desmond Bishop -- Became more appealing to Niners with only three inside linebackers with NFL experience under contract after retirements of Willis and Borland. Bishop purportedly beat out the likes of Lance Briggs and Erin Henderson and signed a one-year deal to return to Niners.
DL Arik Armstead (Oregon)
S Jaquiski Tartt (Samford)
OLB Eli Harold (Virginia)
TE Blake Bell (Oklahoma)
RB Mike Davis (South Carolina)
WR DeAndre Smelter (Georgia Tech)
P Bradley Pinion (Clemson)
OL Ian Silberman (Boston College)
T Trent Brown (Florida)
TE Busta Anderson (South Carolina)
Undrafted free agents
QB Dylan Thompson (South Carolina)
WR Dres Anderson (Utah)
WR Issac Blakeney (Duke)
WR DiAndre Campbell (Washington)
WR Darius Davis (Henderson State)
WR DeAndrew White (Alabama)
OL Patrick Miller (Auburn)
DL Marcus Rush (Michigan State)
S Jermaine Whitehead (Auburn)
CB Mylan Hicks (Michigan State)
OL Justin Renfrow (Miami)