According to ESPN's Chris Mortensen, Crabtree has already undergone surgery on his torn Achilles tendon.

Analysis: Details will continue to trickle in with regards to the severity of Crabtree's Achilles tendon tear and the estimated timetable for his return, but either way, his injury will have a major impact on the 49ers' plans for the coming season. At first glance, the team's acquisition of Anquan Boldin takes on added importance, with the likes of A.J. Jenkins potentially in line for added opportunities, as well as TE Vernon Davis and WR Quinton Patton.

The Jaguars have released Pendleton.

Analysis: Pendleton played in the last four games of the season but was largely held off the scoresheet with just one tackle.

Nicks (knee) was not present at Wednesday's OTAs, the New York Daily News reports.

Analysis: It sounds like Nicks is in the New York area and the Giants were expecting him to show up. He may still be somewhat limited after undergoing arthroscopic surgery on his knee, but that doesn't explain his absence Wednesday. We'll keep you posted on any further updates regarding Nicks.

According to Mike Garafolo of USA Today, Crabtree will reportedly require surgery after suffering a torn Achilles during the 49ers' OTAs.

Analysis: Meanwhile, ESPN's Adam Schefter notes that Crabtree is undergoing additional tests to confirm the injury. We'll await verification of the report, but assuming Crabtree's Achilles is torn as feared, then he would be in line to miss most, if not all, of the coming season. While the 49ers could seek veteran help in the wake of this development, young receivers A.J. Jenkins and Quinton Patton could well be called upon to help fill the void.

McClain (back) was a limited participant in Tuesday's OTAs, the Baltimore Sun's Aaron Wilson reports.

Analysis: McClain is recovering from a spinal cord contusion that ended his 2012 season in December. He looks like a good bet to hold down one starting inside linebacker spot, that is if he's healthy. While the early reports have been positive, the injury necessitates a cautious approach.

Webb (knee) participated on a limited basis in Tuesday's OTAs, the Baltimore Sun's Aaron Wilson reports.

Analysis: Webb is rehabbing a torn ACL that he suffered last October. The Ravens are currently operating under the expectation that they will have their No. 1 cornerback available for Week 1.

The Chiefs have signed Demps, the team's official site reports.

Analysis: With Demps added to the team's backup safety mix, the Chiefs released fellow safety Justin Glenn, as well cornerback James Rogers on Wednesday.

Urlacher has announced his retirement from the NFL.

Analysis: There had been some speculation that the long-time Bear would catch on with the Vikings, but the middle linebacker has instead decided to call it a career after 13 years in the NFL.