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SYDNEY, AUSTRALIA - MAY 15: James Graham of the Bulldogs leaves the field after being knocked out during the round 10 NRL match between the Canterbury Bulldogs and the Sydney Roosters at ANZ Stadium on May 15, 2015 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)

SYDNEY, AUSTRALIA - MAY 15:  James Graham of the Bulldogs leaves the field after being knocked out during the round 10 NRL match between the Canterbury Bulldogs and the Sydney Roosters at ANZ Stadium on May 15, 2015 in Sydney, Australia.  (Photo by Mark Kolbe/Getty Images)