Sigle (coach's decision) is inactive for Sunday's game against the Giants, Briana Jeannel of the 49ers' official site reports.

EDGE Analysis

The safety started the first seven games of the season and played on every defensive snap from Week 1 to Week 5, but he saw his playing time drop from 62 percent of the defensive snaps to 31 percent to zero over the last three weeks, following the return of Malik Mustapha (knee) from injured reserve. Jason Pinnock is serving as San Francisco's third safety behind Mustapha and Ji'Ayir Brown.

Sigle recorded two tackles (one solo) while playing just 31 percent of San Francisco's defensive snaps in Sunday's 20-10 win over Atlanta.

EDGE Analysis

Sigle played every one of San Francisco's defensive snaps from Week 1 to Week 5, but he dipped to a 62 percent share upon the return of Malik Mustapha from IR in Week 6 versus Tampa Bay. The rookie safety's defensive snap share then dropped to 31 percent Sunday, with Mustapha at 69 percent and Jason Pinnock at 35 percent. David Lombardi of SFStandard.com suggests that Mustapha will ultimately be a regular starter while Sigle, Pinnock and Ji'Ayir Brown -- who played every defensive snap Sunday -- contend for the No. 2 spot.

Sigle registered four tackles (all solo) Sunday in a loss to the Buccaneers.

EDGE Analysis

Sigle tied for third on San Francisco with his four tackles. That total was, however, his lowest of the season. Through six weeks, the rookie safety has tallied 43 tackles and two defensed passes.

Sigle registered 13 tackles (seven solo) and one pass defense during Thursday's 26-23 overtime win over the Rams.

EDGE Analysis

Sigle reached double-digit tackles for the first time this season, and he finished Thursday's game with the second most tackles behind Rams linebacker Nate Landman (14). Sigle has played every defensive snap in each of the first five games of the regular season and is up to 39 tackles (22 solo), two pass defenses and one forced fumble. His playing time could take a dip with Malik Mustapha (knee) close to returning from the reserve/PUP list.

Sigle logged eight tackles (six solo) and one pass defense during the 49ers' 26-21 loss to the Jaguars on Sunday.

EDGE Analysis

Sigle played every single snap for a fourth consecutive game, and the rookie fifth-rounder finished tied with Fred Warner for the second most tackles on the 49ers behind Dee Winters (10), who is nursing a knee injury. Sigle has opened his rookie season with 26 tackles (15 solo), one pass defense and one fumble recovery through four games.

Sigle will be the 49ers' starting safety against the Seahawks on Sunday, Matt Maiocco of NBC Sports Bay Area reports.

EDGE Analysis

Per Maiocco, Sigle becomes the first 49ers rookie to start at safety in Week 1 since Eric Reid in 2013. With Malik Mustapha (knee) starting the season on the reserve/PUP list, Sigle will start alongside Ji'Ayir Brown at safety, while Jason Pinnock and Siran Neal serve in a rotational role.

Sigle (knee) logged three tackles (three solo) in San Francisco's preseason win over the Raiders on Saturday.

EDGE Analysis

Sigle had suffered a knee injury in practice earlier this month but is now healthy again. The 23-year-old was selected by the 49ers in the fifth round of this year's draft, and he is looking to earn a spot on the team's final roster as a backup safety.

San Francisco head coach Kyle Shanahan said Saturday that Sigle will still undergo testing but that initial indications are that he's avoided a serious knee injury, Nick Wagoner of ESPN.com reports.

EDGE Analysis

Sigle was forced out of Saturday's 30-9 preseason loss to the Broncos early due to a knee issue, and Shanahan praised the rookie fifth-round pick's level of play prior to his departure. It remains to be seen, however, whether Sigle's injury will impact his status for the 49ers' next preseason contest on Saturday, Aug. 16 at Las Vegas.