Micah Parsons' Green Bay Packers debut is suddenly in question as he deals with a facet joint sprain in his back, several reports said Monday.

The Packers acquired Parsons in a blockbuster deal with the Dallas Cowboys last Thursday and gave him the richest contract for a non-quarterback in NFL history, worth $47 million a year.

But before the deal, the Cowboys had placed Parsons on a five-day plan of a corticosteroid to help back inflammation and had him on a physical therapy program. Parsons may need an epidural injection to play Sunday against the Detroit Lions, according to reports from ESPN, NFL Network and The Athletic.

Monday was Parsons' first official day at Packers practice. He did not participate in practice with Dallas throughout training camp as he engineered a hold-in.

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