New York Giants wide receiver Sterling Shepard was initially expected to play during his team's Week 9 matchup with the Dallas Cowboys on Monday night, but he ended up being sidelined.

Shepard, who has been dealing with concussion symptoms throughout much of the year, was cleared from concussion protocol last week before reporting more symptoms to the club on Saturday.

He is now back in the protocol.

The Giants are not messing around with Shepard's injury, with head coach Pat Shurmur saying it is a “serious injury and it requires a serious response” during a conference call on Tuesday, per Josh Alper of Pro Football Talk.

Shepard has had two concussions this season.

In the four games he has played, he has logged 25 catches for 267 yards and a touchdown.

Shurmur would not say whether or not Shepard would ultimately be shelved for the remainder of the 2019 campaign, but he did add that New York would use “good judgment” when it comes to bringing the wideout back.

The Giants signed Shepard to a four-year contract extension back in March.

Shepard, who played his collegiate football at the University of Oklahoma, was originally selected by New York in the second round (40th pick overall) of the 2016 NFL Draft.

He had an impressive rookie year, playing in all 16 games and hauling in 65 receptions for 683 yards and eight touchdowns. Injuries then limited the 26-year-old to 11 contests in 2017, but he still managed to catch 59 passes for 731 yards and a couple of scores.

In 2018, Shepard once again participated in every game, snaring 66 balls for 872 yards while reaching the end zone four times.