Arizona Cardinals star wide receiver DeAndre Hopkins is looking for answers after a questionable moment during Sunday’s loss to the Minnesota Vikings.

The five-time Pro Bowler took to social media on Sunday to ask the NFL for an explanation following a violent helmet-to-helmet hit he took in the end zone, late in the third quarter. 

DeAndre Hopkins reacts to incomplete pass

Arizona Cardinals wide receiver DeAndre Hopkins reacts after an incomplete pass against the Minnesota Vikings, Sunday, Oct. 30, 2022, in Minneapolis. (AP Photo/Abbie Parr)

Hopkins was walking back into the end zone, attempting to catch a short pass from Kyler Murray when he was tackled by cornerback Cameron Dantzler. After the ball fell from Hopkins’ hands, safety Harrison Smith seemingly leaned in for a hard hit, making contact with his head. 

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There was no call on the play despite Murray’s frustrations with the hit. 

"... NFL I need an explanation?" Hopkins wrote on Twitter. 

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DeAndre Hopkins touchdown against Vikings

DeAndre Hopkins of the Arizona Cardinals catches the ball for a touchdown against the Vikings at U.S. Bank Stadium on Oct. 30, 2022, in Minneapolis, Minnesota. (Adam Bettcher/Getty Images)

Sunday was Hopkins' second game back since serving a six-game PED suspension. He hauled in an incredible one-handed catch late in the first half to bring the Cardinals within reach of the Vikings, but it wasn’t enough to top Minnesota, which won their fourth straight. 

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DeAndre Hopkins reaches out for ball

DeAndre Hopkins of the Arizona Cardinals catches the ball for a touchdown on Oct. 30, 2022 in Minneapolis, Minnesota. (Adam Bettcher/Getty Images)

Hopkins finished with 12 catches for 159 yards and one touchdown. 

The Associated Press contributed to this report.