Of the 53 players on the AFC West side's active roster, 23 have joined during the off-season.
The team's president told Chargers.com: "I think the single biggest difference going into this season obviously is we have 23 new players of the 53 man squad coming in.
"It's a younger team by far, a faster team. So it's quite a turnover but I think we still have a good core group of players in our organisation and on our team and I think we'll be very competitive.
"I'm excited. It's been a long off-season. Obviously an exciting off-season and I think an exciting pre-season. I know the players are ready for Monday night. The organisation is and I know the fans are so I'm excited."
The Chargers play the Houston Texans on Monday.