After a torn ACL forced him to miss all of his first season with the Niners, McKinnon was activated from the active/physically unable to perform list on Tuesday, the team announced.
Here are other notes and news we're monitoring on Tuesday:
- A pleasant sight came Tuesday at Atlanta Falcons practice, as rookie first-round selection Kaleb McGary was with the team as an observer, NFL Network's Mike Garafolo reported.
Garafolo added Atlanta coach Dan Quinn said McGary's presence was a good sign and that doctors were "pleased" with the offensive tackle's progress.
McGary underwent a cardiac ablation procedure -- a minimally invasive approach that can correct heart rhythm problems -- on Wednesday.
NFL Network Insider Ian Rapoport added that it's going to be a "wait-and-see" in terms of McGary's return as the team has done research on other athletes with similar ailments and their returns have varied.
During his college days at Washington, McGary had two similar procedures.
- New York Jets receiver Quincy Enunwa left Tuesday's practice early with an apparent groin injury. Following the practice, New York coach Adam Gase said Enunwa would have tests on his groin, but that the wideout wanted to return to practice, a possible indicator that the injury is not serious.
Defensive tackle Leonard Williams had an MRI on his hip, according to Gase, and the team is keeping him out of practice as a precaution.
- Five-year veteran defensive end Kasim Edebali signed with the Philadelphia Eagles on Tuesday as the team also announced the placement of DE Joe Ostman (knee) on injured reserve. The team has also signed cornerback Ajene Harris and waived/injured offensive tackle Casey Tucker.
- The Buffalo Bills announced the signing of offensive tackle Jarron Jones on Tuesday morning as a corresponding move of placing offensive tackle LaAdrian Waddle (quad) on injured reserve.
- Oakland Raiders receiver Antonio Brown (feet) missed practice yet again on Tuesday and told the Las Vegas Review-Journal's Michael Gehlken that they are "gathering information" on his injury.
- New York Giants receiver Sterling Shepard (broken thumb) gave reporters an update on his comeback trail Tuesday, stating "I have to hold myself back from time to time." Shepard added he will get another X-ray soon as he's continued practicing with a yellow jersey. "My thumb is broken, but my legs aren't," he said.
Coach Anthony Lynn told the media that defensive tackle and first-round pick Jerry Tillery (shoulder) and safety Nasir Adderley (hamstring) will not play in Thursday's preseason opener.
- Per Falcons reporter William McFadden, coach Dan Quinn expects CB Desmond Trufant (back sprain) to return soon.
- The Detroit Lions have agreed to terms for a two-year extension with guard Joe Dahl, Rapoport reported Tuesday. Dahl's deal extends him through 2021 as the key backup now vies for a starting role on the line.
- Indianapolis Colts defensive end Jabaal Sheard has undergone a procedure on his knee, coach Frank Reich said Tuesday. Reich added per the team's Twitter account: "We've just got to take it slow and be cautious and make sure that we have Jabaal for the long haul."
- Jacksonville Jaguars linebacker James Onwualu suffered a "significant" injury on Monday, and coach Doug Marrone said Tuesday that the team does not expect him back this season. Onwualu had been listed as a co-starter at strong-side linebacker.
- Tampa Bay Buccaneers defensive tackle Vita Vea left practice early on Tuesday with an apparent leg injury, according to the Tampa Bay Times. Bucs coach Bruce Arians didn't have an update on Vea after practice, telling reporters, "I haven't seen him since so I don't know. We'll check on him and we'll see what the report is tomorrow. ... I just saw him walking in and he looked fine."