MADS Andersen and Jordan Williams are unlikely to be available for the first games after the international break.
Centre-back Andersen has missed the start of the season due to a knee injury while full-back Williams joined him on the sidelines last month.
Barnsley visit AFC Bournemouth a week tomorrow after the current international break.
Coach Joe Laumann told the Chronicle: “It might be a little bit longer.
“They are doing well with the physios but we don’t want to risk them. They are looking good but we’re not sure yet when we will get them back.”
Striker Carlton Morris is expected to return next month following a knee injury.