Adam Schefter breaks down when Joey Bosa and the Chargers could come to terms on a contract and if there's a possibility Bosa could miss the start of the season. (1:00)

SAN DIEGO -- With the team reaching Day 25 since rookies had to report and first-round pick Joey Bosa still unsigned, the San Diego Chargers are preparing for the regular season as if the Ohio State product will not be available for the season opener on the road against the AFC West rival Kansas City Chiefs.

Bosa and the Chargers are still locked in a contract stalemate over offset language and the earlier payment of deferred signing bonus money.

Chargers head coach Mike McCoy would not provide a timetable for Bosa getting into game shape, if and when he reports to Chargers Park.

Chargers 2016 first-round pick Joey Bosa -- the No. 3 overall pick in the draft -- has not participated in training camp. Kamil Krzaczynski/USA TODAY Sports

However, asked if someone playing defensive end in San Diego's system could function, given a slimmed-down version of the playbook, McCoy said: "We're going to play everybody. If you have a uniform, you're going to play. And that's what the good teams do up front. They're going to rotate everyone and keep everybody fresh."

The Chargers dropped Bosa from third string to fourth string at defensive end on the team's latest depth chart. Darius Philon is listed as the starter, followed by Tenny Palepoi, Zamir Carlis and Bosa. With the Chargers preparing for the team's regular-season dress rehearsal -- Sunday's preseason matchup against the Minnesota Vikings -- San Diego must move forward as if Bosa will not be available for the season opener in three weeks.

"We'll have a plan for him whenever he's here," McCoy said. "We've talked about it over time, from the very beginning of camp. So we've got a plan for when he's in the building. But I'm very pleased with the other 89 guys in camp at this point in time."

Specifically, McCoy indicated that he has been pleased so far with the play of Bosa's replacements, second-year pro Darius Philon and 2014 undrafted rookie Tenny Palepoi.

"I just love his energy," McCoy said of Philon. "He comes to practice every day. He works hard. He loves to play the game."

After a productive 2014 season, Palepoi missed all of the 2015 season after suffering a fractured foot during training camp. The Utah product said he dropped 35 pounds, and at 6-foot-1, he will play at 280 pounds this season.

"Philon has been doing a good job stepping in," Palepoi said. "And just the depth that we have on the defensive line is the big contribution this year. We feel like we're deep at every single position, so I think we're in good hands right now."

Palepoi said that even though he's lighter than his college weight, he has maintained enough strength and explosion to take the constant pounding as an interior defensive lineman.

"He's very quick," McCoy said of Palepoi. "He's coming off the ball. He's lighter. He's worked extremely hard. Give him a lot of credit: That was tough injury last year early on, and what he went through and how hard he worked. But he's been the same way. He hasn't skipped a beat."