A nasty collision that left Bomber Sam Weideman concussed has forced Essendon to call on their tactical sub against GWS.

The incident took place early into the second quarter of Saturday's clash at Marvel Stadium, with Weideman moving back with the flight of the ball into GWS defender Nick Haynes, with the pair both looking to contest for the ball.

While attempting to spoil the ball, Haynes lept in the air and collided with Weideman, whose face was struck by Haynes's hip, leaving the Bombers forward with blood pouring from his mouth.

Weideman was assisted off the field and sent down to Essendon's change rooms, with veteran Dyson Heppell brought into the game soon after the incident.

Essendon have confirmed that Weideman was ruled out of the remainder of the match due to concussion, with the required protocols set to see the tall forward miss next week's clash with his former club Melbourne.

Haynes was able to continue in the contest after a short on-field assessment from the Giants' medical team.

Heppell was part of a late side change for Brad Scott's squad prior to the match, with the former Essendon captain moved to that tactical sub role after being named as part of the starting 22-man side.

Ruckman Andrew Phillips was a late inclusion in place of Heppell.

Essendon WON BY 13 POINTS
Marvel Stadium