Owens is ruled out due to a longstanding commitment, but Scorpions coach Mike Grady remains confident.
Grady said: “The lads are chomping at the bit and ready to go. We’re looking forward to it.”
He added: “I regard Oldham as favourites to get promotion, and they’ll be desperate to start with a win.
“But we want to improve on last year, and the play-offs have got to be a realistic goal for us. It’s going to be tough, but we’ve just got to fire into it.”
Oldham coach Scott Naylor said: “We’re taking precautions with those three, but I think they’ll be OK.”