EAST RUTHERFORD, N.J. – Defensive lineman Mykel Williams, the 49ers’ first-round draft pick, sustained what the 49ers fear is a season-ending tear to his right knee’s anterior cruciate ligament.

Williams got hurt with four minutes remaining in Sunday’s 34-24 win over the host New York Giants.

The 49ers’ lead was at 34-17 when Williams lined up at left defensive end, raced past left tackle Marcus Mbow, and grasped at quarterback Jaxson Dart as he backpedaled and unleashed an incomplete pass from the Giants’ 31-yard line.

Williams immediately grabbed at his right knee and banged his hands into his helmet while splayed on his back on the MetLife Stadium’s synthetic field, which has long come under fire for safety concerns.

Williams walked off the field under his own powers and eventually

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