Lissemore was placed on injured reserve Monday after suffering a shoulder injury, Tom Krasovic of the San Diego Union-Tribune reports.

EDGE Analysis

Lissemore was looking to rebound from a poor 2015 season in which he managed to play in just 11 games, tallying 16 tackles. While the 28-year-old was not expected to start this season, the injury will tax the Chargers depth along the defensive line, forcing unheralded players such as Ryan Carrethers or Chuka Ndulue to receive additional snaps on the defensive front.

Lissemore (shoulder) is officially inactive for Sunday's game at Kansas City.

EDGE Analysis

This is terrible news for a defense that has been slammed with injuries this year. With Corey Liuget being placed on injured reserve earlier this week, look for Ryan Carrethers and Ricardo Mathews to see more time on the defensive front.

Chargers acquired DL Sean Lissemore from the Cowboys in exchange for a 2015 seventh-round draft pick. Lissemore was a bad fit for the Cowboys' new 4-3 defense, so he'll join DC Chuck Pagano's 3-4 scheme in San Diego. At 6-foot-3, 298, he's best-suited to play one of the end spots. In 329 snaps with the Cowboys last season, Lissemore recorded 35 tackles and one sack. He'll be the top backup to Kendall Reyes and Corey Liuget. Lissemore showed promise as a run stopper in 2011.

According to ESPN Dallas, the Cowboys are "looking at" moving DL Sean Lissemore from end to tackle in new DC Monte Kiffin's 4-3 defense. Lissemore has extensive experience at both positions, so it would be a natural switch. Playing mostly end in 2012, Lissemore notched 35 tackles and a sack in 329 snaps over 10 games. Due just $630,000 in 2013, and only $3.63 million through 2016, Lissemore is a valuable reserve for Big D.

Cowboys DL Sean Lissemore has been diagnosed with a high right ankle sprain, and is out for Week 7. A key reseve capable of playing both end and tackle, Lissemore could miss 3-4 games. His absence will test Dallas' already questionable depth. Lissemore has played heavy snaps this season, notching 20 tackles in five games.

Although X-rays were negative, Cowboys DL Sean Lissemore believes he suffered a high right ankle sprain in Week 6. This can be a month-or-more injury. A key end/tackle reserve, Lissemore has 20 tackles through five games, making two starts. Just as it appeared to be getting healthy, the Cowboys' defensive line has taken another significant blow.

Cowboys DL Sean Lissemore suffered a first-quarter right ankle injury in Week 6 and is done for the day. X-rays apparently revealed the sprain as opposed to a fracture. So we wonder if Lissemore has a high ankle sprain. The Cowboys got Jay Ratliff and Kenyon Coleman back this week, but Lissemore is their top D-Line reserve.

Cowboys signed DL Sean Lissemore to a three-year contract extension.

Cowboys DL Sean Lissemore was limited in OTAs and minicamp by a rib injury, but is expected to be healthy for training camp. "Is he going to be behind for where he wanted to be in training camp? Yes," DL coach Brian Baker said. "But is he going to be too far behind to compete to get one of those solid rotation roles, which is what I expect of him? No." The Dallas Morning News opined in June that Lissemore "seems certain" to play more than the 273 snaps he saw in 2011 this season.

According to the Dallas Morning News, it "seems certain" Cowboys DL Sean Lissemore will have an expanded role this season. Lissemore played just 273 snaps in 2011, but acquitted himself well, especially against the run. He saw time at both end and tackle. "He's so fast for the game now," DC Rob Ryan said. "The nice thing if we ever get in a situation where God forbid somebody gets hurt, (he) can jump in in any spot and be an effective starter."