Washington's star receiver hurt his left knee on Monday night.
McLaurin's knee buckled on a third-down route near the sideline.
No defender hit his knee. He grabbed it and could not get up.
Trainers put his left leg in an air cast. The cart took him off.
Washington ruled him out for the rest of the game within minutes.
He leads Washington with 15 catches for 230 yards this season.
He has 513 career catches for 7,191 yards and 42 touchdowns.
It was the first game since Week 1 with Daniels, McLaurin, and Diggs all healthy.
Stefon Diggs becomes the clear top receiver for Washington.
Rookie Antonio Williams will see a much bigger role right away.
The team will run scans. No timeline exists yet for his return.
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