Here are five things you need to know from Giants practice on Wednesday:

1. GALLMAN PROVIDES SPARK

Rookie running back Wayne Gallman impressed a lot of people last week, himself included. The fourth-round draft choice was inactive the first three games and made his NFL debut against the Buccaneers. He led the team in rushing, in addition to catching a touchdown pass. Injuries to Paul Perkins and Orleans Darkwa opened the door for Gallman, but his performance may have kicked it in.
"Wayne's a young player who plays fast," coach Ben McAdoo said. "I think you saw the speed when he jumped onto the field. He has electricity in his game. He's a talented, young player. He has a lot to learn, but he's very, very willing and works hard at it."

"I was impressed with myself," the Clemson product said. "Just watching NFL football and how it is, I guess [the production] was a lot. I felt like there was more out there. I only played really one half, so best is yet to come."

2. WEDNESDAY'S INJURY REPORT

Did not practice: CB Janoris Jenkins (ankle), DE Jason Pierre-Paul (shoulder/knee), C Weston Richburg (concussion), DE Olivier Vernon (ankle)

Limited: WR Odell Beckham Jr. (finger/ankle), RB Orleans Darkwa (back), WR Brandon Marshall (toe), RB Paul Perkins (ribs)

3. SCOUTING THE CHARGERS

McAdoo opens every Wednesday press conference with a scouting report of the upcoming opponent. The following is what he said about the 0-4 Chargers, whose "film is better than their record."

Offense: "[Philip Rivers] does a nice job distributing the ball to their perimeter. He has a quick release and knows how to play the game. They have very good size and length on the perimeter. [Keenan] Allen is a special player and Tyrell and Mike Williams are there with him, talented players. [Antonio] Gates is a future Hall of Famer who we all know and [Hunter] Henry and [Melvin] Gordon are coming into their own at the tight end and running back positions. Their offensive line is gaining confidence as they go. They're a group that is working well on their confidence and physicality."

Defense: "They are well-coordinated in the Seattle system of Cover 3. They'll mix in some other coverages in there as well. [Melvin] Ingram and [Joey] Bosa are bookends on a good defensive line group who have some depth and [Jatavis] Brown is a fast run and hit linebacker, does a good job tackling. He's the leading tackler in the National Football League. Spent some time with Casey Hayward. Talented player, very smart player, has good instincts and a nose for the football."

Special teams: "Travis Benjamin will put a lump in your throat as a returner. He's had a lot of success."

4. O-LINE PLAYING MUSICAL CHAIRS

Left guard. Right tackle. And even some snaps in practice at center. Justin Pugh is Mr. Versatility on the offensive line, which could have more moving pieces this Sunday while center Weston Richburg remains in the concussion protocol.

Meanwhile, D.J. Fluker started last week for the first time as a Giant at right guard, and John Jerry, who started the previous 26 games at right guard, moved to left guard. Brett Jones, who has started one game at left guard this year, is the backup center. Despite the movement, the Giants have not allowed a sack the last two weeks.

"I find it fun," Pugh said of switching positions. "It's like a new challenge. A lot of times, going in and getting some center reps this week, too, it was like alright something totally different, something totally new. So it's kind of interesting. It kind of keeps me on my toes.

"It helps me be a better guard eventually when I go back to my natural position because I know the struggle as a tackle and I know how to better communicate with [left tackle] Ereck [Flowers] and work with Ereck because I know the stresses in the protections and where he needs help. So it's something that I think is going to make me a better player overall and then hopefully I'll be able to show it."

5. D TRYING TO OVERCOME SLOW START AGAIN

Before finishing as the No. 2 scoring defense last year, the Giants did not get off to the strongest start, and the group hopes that is the case again. In 2016, their true breakout game didn't come until Week 7 when they played the Los Angeles Rams in London, a game remembered for safety Landon Collins' incredible interception return. Including that game, the Giants allowed just 15.3 points per outing the rest of the way. Maybe they can turn things around this week against another L.A. team.

"I feel like last year, early in the season, we weren't that good defensively, and we got better," linebacker and two-time defensive captain Jonathan Casillas said. "I think we're there now. We just don't have any wins to stand up for that. Last year, I feel like we were kind of back and forth. We had some signs of being really good, but we weren't really good yet. We had to get better throughout the season. And I think that's still in front of us."