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Denver Broncos quarterback Russell Wilson's slow start with the Broncos might be partially due to a shoulder injury.

According to an ESPN report, Wilson suffered the injury during the team's Week 4 game against the Raiders. The shoulder injury was described as a partially torn lat.

The Broncos played the Indianapolis Colts in Week 5 on Thursday night. The next day, Wilson traveled to Los Angeles where he underwent a procedure to help improve discomfort levels in his throwing shoulder, according to reports from the NFL Network.

The procedure was a PRP injection to his shoulder, the NFL Network confirmed.

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Russell Wilson against Colts

Russell Wilson of the Denver Broncos scrambles against the Indianapolis Colts at Empower Field at Mile High on Oct. 6, 2022, in Denver. (Cooper Neill/Getty Images)

PRP stands for platelet rich plasma therapy. The procedure typically involves blood being drawn, and then a machine is used to separate "platelets." Those platelets are then re-injected in the body.

The nine-time Pro-Bowl QB has been largely ineffective in his first four games in Denver. He's thrown four touchdowns and three interceptions. The Broncos' offense struggled to gain any real traction in the loss to the Colts on Thursday night.

The 33-year-old quarterback failed to deliver late in the fourth quarter. He threw an interception in the end zone with just two minutes remaining, which gave way to Chase McLaughlin’s game-tying field goal with just seconds left on the clock.

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Wilson completed 21-of-39 passes for 274 yards and threw two interceptions and no touchdowns in the 12-9 overtime loss.

Wilson mentioned his shoulder when he talked to reporters after the Broncos-Colts game.

"You've got to look at this — I've got to look at this and see where I can get better," Wilson said in his postgame presser. "I was battling, obviously, just the shoulder and all that and just trying to play quickly. We should have won that game. [We] should have won it. Like I said, it's on me. The one thing that I know is I've gone through tough times before. I've gone through obstacles, I've gone through challenges, gone through highs as well as lows. A lot of highs, several lows, and I wasn't ever getting discouraged ever."

The Broncos currently sit at 2-3 on the season.

Russell Wilson warms up before Colts game

Russell Wilson of the Denver Broncos warms up before kickoff against the Indianapolis Colts at Empower Field at Mile High on Oct. 6, 2022, in Denver. (Cooper Neill/Getty Images)

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Wilson was listed on the Broncos' injury report on Tuesday with a shoulder strain. He only participated in practice on Wednesday, one day ahead of the Thursday night matchup.

Head coach Nathaniel Hackett said the quarterback experienced some soreness after the team's Week 4 loss to the Raiders.

Wilson was traded from the Seattle Seahawks during the offseason in a blockbuster deal involving multiple draft picks and three other players.

Russell Wilson scrambles for throw

Russell Wilson of the Denver Broncos passes during the first quarter against the Seattle Seahawks at Lumen Field on Sept. 12, 2022, in Seattle. (Steph Chambers/Getty Images)

In September, Wilson signed a five-year contract with the Broncos worth $245 million.

The injury is not expected to require surgery, per the ESPN report.

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Wilson is expected to play in the Broncos' Week 6 matchup against the Los Angeles Chargers. But, the team has not provided any official updates on the quarterback's availability.