Cooper exited practice early Wednesday due to a groin injury, Rob Demovsky of ESPN.com reports.
Head coach Matt LaFleur downplayed the situation, calling it a "little groin injury" for Cooper. The rookie linebacker had an impressive showing during minicamp and was working to parlay that into a starting role during training camp. He'll now look to get healthy and return to the field so he can continue his quest for a prominent role on the Packers' defense.