Melbourne's stand-in five-eighth Maurice Blair says he's only a 50:50 chance of playing in Sunday's NRL qualifying final against Newcastle.

Blair damaged his hamstring in the Storm's final round loss to Sydney Roosters.

"It's coming along pretty good, it's still 50:50 at the moment," Blair said on Friday ahead of the AAMI Park clash.

"I'm in the team and we've got one more training session tomorrow so we've got to get through that.

"It's improving every day."

Blair was named at five-eighth as the replacement for regular No.6 Gareth Widdop, who injured his ankle in the same game and is sidelined for at least two weeks.

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