Davis announced his retirement from the NFL on Friday, ESPN reports.

Davis' retirement statement details his desire for time off from football for his brain and body to heal. As already one of the NFL's premier offensive tackles at just 25 years old, Davis' retirement is certainly surprising, but it appears health concerns played a prominent role in his decision. In retiring, Davis joins Patrick Willis, Justin Smith and Chris Borland as key 49ers that have all decided to hang up their cleats this offseason.

Davis (knee) is active for Sunday's game against Denver, sacbee.com reports.

The report notes that Davis will start at right tackle on Sunday, which puts him in line to draw the assignment of trying to contain Denver pass-rusher Von Miller.

Davis (knee) is inactive for Monday's game against the Rams, csnbayarea.com reports.

With Davis out, Jonathan Martin is on track to find himself in the 49ers' starting lineup for the fifth time in six games.

Davis (knee) has a sprained MCL and is unsure if he will play against the Rams, The Sacramento Bee's Matt Barrows reports.

His shoulder, then his hamstring, and now his knee, Davis has played in only one game this season due to a series of medical issues. In the second season of a five-year extension, the 49ers will likely be careful when it comes to an MCL injury. Jonathan Martin will be the replacement at right tackle if Davis is indeed out.

Davis (knee) is inactive for Sunday's game against the Chiefs.

The injury woes continue for Davis, who has played in just one game this season due to knee and hamstring problems. Jonathan Martin will take Davis' place on the offensive line.

Davis (knee) did not practice Wednesday, but his knee injury doesn't seem to be as serious as originally thought, the Sacramento Bee reports.

Davis had his leg rolled on Sunday against the Eagles, and it looked like he may have sustained a serious knee injury. However, he was seen walking around the 49ers' facility comfortably without his knee wrapped Wednesday, indicating that the injury isn't of the serious variety. His participation in practice the remainder of the week will give a better indication of his availability this Sunday against the Chiefs.

Davis left Sunday's game against Philadelphia with an apparent knee injury and did not return.

Davis had just returned from a hamstring injury that sidelined him for the first three games of the season, and he was forced to exit after having his leg rolled on by a teammate. The veteran tackle was able to walk off the field under his own power, but his status for week 5 is unclear.

Davis (hamstring) is active for Sunday's game against Philadelphia, the Sacramento Bee reports.

In his return to action Sunday, Davis is slated to take over the 49ers' right tackle spot, which should be a boost to the team's ground game.

Davis (hamstring) is questionable for Sunday's game against Philadelphia.

Davis was a limited practice participant all week, so it seems like he has a decent chance of making his 2014 debut Sunday. His eventual return will be a nice boost to the right side of San Francisco's offensive line.

Davis (hamstring) was a limited participant at practice Thursday, according to the Sacramento Bee.

Davis has missed the 49ers' first three games with a nagging hamstring injury. His participation in practice, albeit limited, is an indication that he may return to the field Sunday against Philadelphia. If Davis were able to suit up, it would provide a major boost to the run game and improve the pass protection as well.

Davis (hamstring) is listed as inactive for Sunday night's game against the Bears.

Davis sat out the entire practice week due to a hamstring injury and will miss San Francisco's home opener Sunday night as well. As a result, the 49ers are expected to start Jonathan Martin at right tackle versus Chicago.

Davis (hamstring) is questionable for Sunday's game against Chicago.

Davis didn't practice all week, so it would seem that he isn't the greatest bet to play Sunday.

Davis (hamstring) is out for Sunday's game against Dallas.

Davis' loss is a significant one in terms of the talent drop-off from him to Jonathan Martin, but luckily for San Francisco, they're facing a Dallas front seven that has to be the worst in the league on paper.

Davis (hamstring) is doubtful to play in Sunday's season opener against Dallas, CSN Bay Area reports.

Davis recently proclaimed that he would be ready for week 1 after undergoing offseason shoulder surgery. But this recent hamstring injury has his availability for the season opener is serious jeopardy. Jonathan Martin would start in Davis' place if he is indeed out.

Davis (shoulder) said that he'll "be ready to play in week 1," the San Francisco Chronicle reports.

Davis was recovering from offseason shoulder surgery, but it was generally accepted that he would suit up week 1. His statement assures that assumption. He will the 49ers' starting right tackle.

Davis (shoulder) participated in individual drills for the first time this offseason, Matt Barrows of the Sacramento Bee reports.

Davis has been recovering from offseason shoulder surgery and has yet to participate in any aspect of training camp so far. Tuesday's news is a good sign that he will be ready for the season opener, but the team has not announced whether he will be ready to suit up for the 49ers' third preseason game this Sunday against the Chargers.

Davis (shoulder) didn't participate in Sunday's preseason game against the Broncos.

Davis has been held out of both preseason games while he continues to recover from offseason shoulder surgery. There is no timetable for his return but the team is hoping Davis will be ready for the start of the regular season.

Davis (shoulder) is not fully recovered from off-season shoulder surgery and will not be ready for the 49ers' first preseason game Thursday, CSN Bay Area reports.

Davis underwent off-season shoulder surgery for an injury he sustained in week 3 last season and he has yet to be cleared for physical activity. At this rate, it seems as though his availability for the regular season opener is in jeopardy. Jonathan Martin has been filling in at right tackle.

49ers RT Anthony Davis recently underwent surgery on his left shoulder.

Davis injured the shoulder in Week 15, but never missed a game, suiting up through the 49ers' NFC Championship Game loss to the Seahawks. The No. 11 overall pick of the 2010 draft, Davis has never missed a start. One of the game's top right tackles, Davis signed a five-year extension last offseason. He should be ready for training camp.

Sources tells CSN Bay Area that RT Anthony Davis' new contract includes $7.25M in de-escalators if he fails to complete workout and weight requirements.