Graham, who joined the Knights from the Dolphins at the end of last season, has been used mainly as an interchange foil for Crossland. He has started twice for the Knights since switching clubs, and four times across his NRL career.
Crossland was suspended for four games on Tuesday night after a tackle that broke the leg of Penrith's Nathan Cleary. The New Zealand international described the fallout as "the worst couple of days of my life". He will miss the grand final and the start of the Kiwis' World Cup campaign.
The Knights have also named uncapped rookie Diesel Hagan in their extended squad, raising the prospect of the first player to debut in a grand final since Eddie Lockhart for Balmain against the Roosters in 1936.
Graham said he was ready for whatever the team needs from him. "A few weeks back in New Zealand, before the finals, I started over there against a quality outfit," he said. "Going into that week, I knew I had to stand up because Phoenix was out, and I just tried to bring what he brings to the team."
Graham paid tribute to Crossland, who won the Danny Buderus Medal as Newcastle's best player of the season. "He's been massive," Graham said. "We're best mates on and off the field. He epitomises what a Newcastle Knights player is, and everyone looks up to him."