Celek (back) announced his decision to retire from the NFL on Friday, Nick Wagoner of ESPN.com reports.

EDGE Analysis

Celek appeared in five games with San Francisco in 2019, during which he contributed as a blocker across 63 snaps on offense. He spent the entire duration of his eight-year career with the 49ers, most notably having surpassed 300 receiving yards in two straight seasons with the team from 2016-17.

The 49ers placed Celek (back) on injured reserve Thursday, Field Yates of ESPN reports.

EDGE Analysis

Celek spent the first nine weeks of the season on the PUP list due to a back injury, and he'll now shift to IR due to what appears to be a related issue. The veteran appeared in five contests with the 49ers in 2019, during which he played 63 snaps on offense but was not targeted.

Celek finished second in tight end snaps behind George Kittle with 31 percent in Sunday's 37-8 win over Green Bay.

EDGE Analysis

Celek returned from injured reserved Week 10, but this was the first time he finished with more snaps over fellow backup Ross Dwelley. It could have just been scheming, but it is worth noting that the veteran has routinely served as the backup tight end in this offense due to his plus blocking skills. Even with an elevated role, Celek does not carry fantasy value heading into Sunday's contest with Baltimore.

Celek (back) has no injury designation for Sunday's game against the Cardinals, Josh Weinfuss of ESPN.com reports.

EDGE Analysis

Celek turned in two limited practices during the week before logging a full one Friday. He'll hope to log more than the 12 snaps he saw in his season debut Week 10.

Celek (back) was a limited participant in Wednesday's practice, Cam Inman of The San Jose Mercury News reports.

EDGE Analysis

Celek recovered from a back injury and returned from the PUP list for Week 10's loss to the Seahawks. The 31-year-old tight end logged 12 offensive snaps in his season debut, and he didn't garner a target despite George Kittle (knee/ankle) being out of the picture. There's no reason to think Celek won't be able to play Sunday against the Cardinals as long as he stays on the practice field in some capacity.

The 49ers activated Celek (back) from the PUP list Monday, Matt Barrows of The Athletic reports.

EDGE Analysis

Celek is eligible to play in Monday's game against the Seahawks, and his activation signals George Kittle (knee) -- who was considered doubtful -- will be inactive. He suited up in 15 games for the Niners last year, catching five passes for 90 yards and two scores. Celek will compete with Levine Toilolo and Ross Dwelley for reps, although the 31-year-old may be limited with minimal practice leading up to the contest.

Celek's (back) 21-day window to return from the PUP list was opened by the 49ers on Tuesday.

EDGE Analysis

Celek has been out all year after offseason back surgery. He now gets up to three weeks to practice before the team has to decide whether to activate him or let him miss the rest of 2019.

The 49ers placed Celek (back) on the reserve/PUP list to begin the season, per the league's official transactions report.

EDGE Analysis

Celek is working his way back from offseason back surgery. He may return in the regular season, but will not be eligible to play or practice for the first six weeks.

Celek was placed on the 49ers' physically unable to perform list Friday with a back injury, Matt Maiocco of NBC Sports Bay Area reports.

EDGE Analysis

Celek underwent back surgery this offseason. It was originally reported in early June that the 31-year-old would miss two months, but Niners general manager John Lynch told Eric Branch of the San Francisco Chronicle that Celek will likely start the regular season on the PUP list.

Celek underwent back surgery this offseason and will be out for two months, Matt Maiocco of NBC Sports Bay Area reports.

EDGE Analysis

Head coach Kyle Shannan mentioned two weeks ago that Celek was going to be sidelined for most of the offseason while still in concussion protocol, but it turns out back surgery is the main reason why. Celek will certainly miss training camp, and it's unclear whether the tight end will be ready for the start of the regular season or not.