Midfielder Oster is in light training after an ankle injury but is not ready to return while former Fulham striker John remains on the sidelines with a thigh strain.
Ishmail Kamara has undergone a shoulder operation which will keep him out for a couple of months and fellow forward Steve Kabba remains a long-term absentee with a knee injury.
Liam O'Brien has an ongoing hernia problem so Graham Stack continues in goal.
Recent loan signings Andy Iro and George Barker were on the bench for Barnet's last outing, the 1-0 defeat at Cheltenham a fortnight ago, and are pushing to make their debuts.
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