Oakland Raiders wide receiver Tyrell Williams is dealing with plantar fasciitis, which could be a big reason for his thin production over the last three weeks.

Offensive coordinator Greg Olson says that Williams is in pain, but that he is doing what he can to manage it:

“Plantar fasciitis, it’s a pretty significant injury, but he’s battling through it,” said Olson, according to Vic Tafur of The Athletic. “He’s taking medication before every game trying to manage the pain.”

Over the last three games, Williams has logged just six catches for 62 yards, all Raiders losses.

On the season overall, he has tallied 36 grabs for 524 yards and five touchdowns as Oakland's No. 1 receiver, a role he was not initially expected to have, as Antonio Brown was supposed to be the top wide out.

However, the Raiders released Brown just before the season began, making Williams the first option for Derek Carr by default.

Oakland signed Williams to a four-year deal back in March.

The 27-year-old, who played his collegiate football at Western Oregon, went undrafted but eventually landed with the San Diego Chargers in 2015.

He logged just two catches during his rookie campaign, but the following year, Williams broke out, hauling in 69 receptions for 1,059 yards and seven scores.

While Williams has yet to replicate his 2016 production, he has remained a steady contributor over his last three seasons.

The Raiders appeared to be in the driver's seat to nail down a Wild Card spot in the AFC, but Oakland has lost three straight games to fall to 6-7 on the year.

Oakland will take on the Jacksonville Jaguars on Sunday.