Antonio Gates working his way back from MCL knee sprain

Antonio Gates has 18 catches for 187 yards and two touchdowns in just two games this season. Jeff Gross/Getty Images

SAN DIEGO -- Veteran tight end Antonio Gates had to watch from the sideline while the San Diego Chargers suffered a disheartening loss to the Oakland Raiders.

Gates said he has an MCL knee sprain and his hopeful to get out on the practice field this week after missing last week's game. Gates said he tested the knee on Saturday, but didn't feel comfortable enough moving laterally, a key to his success on the field.

Gates already missed the first four games of the season due to a suspension and is anxious to get back on the field. In his first two games back, Gates totaled 18 receptions for 187 yards and two touchdowns.

"It was difficult with what I was dealing with, and how I play and how I move," Gates said. "Hopefully this week it's gotten a lot better, and I'll just see how it goes. It's kind of like day-to-day with me.

"I'm doing everything known to man to go out and play. I can't tell you how frustrating it is to be out after sitting out four weeks, and then having to come back and deal with something like this that's lingering."

The Chargers also received good news on the injury front from last week's Oakland game.

Guard Orlando Franklin suffered a Grade II MCL strain in his left knee that looked more serious when he was carted off in the second half.

Franklin missed just one start in four seasons with the Denver Broncos with a high-ankle sprain. Franklin has played football since he was 7-year-old, and said that was the first game he had missed due to injury until this season.

"It's football," Franklin said. "It's a 100 percent injury rate. That's just what it is. Unfortunately, I've been having a rough season when it comes to that."

Franklin also missed three games earlier this year with an ankle sprain, but is working to get back on the field sooner rather than later.

Rookie linebacker Denzel Perryman suffered a strained biceps muscle in the first half of San Diego's loss to the Oakland Raiders.

Both Perryman and Franklin are considered day-to-day.

Safety Eric Weddle missed his first start since 2009 with a groin injury. There's no timetable for Weddle's return.