Central midfielder Dougall has not played for the first team since a leg fracture in March but is back in training and has played games on the last three Fridays, twice for the under 23s and once in a behind-closed-doors match. Centre-back Diaby has missed the last six games with an ankle problem.
Caretaker Adam Murray said: “Kenny and Bambo are both doing well but Saturday will probably come too early for them.”
Meanwhile, striker Patrick Schmidt played for Austria under 21s in their 5-1 loss to England on Tuesday then picked up an injury in training at Oakwell the following morning.
The 21-year-old, whose four appearances for the Reds have all been from the bench, is not thought to be seriously injured but is a doubt for tomorrow’s game against Swansea. He came on after 69 minutes with his side 4-1 down in Milton Keynes after also coming off the bench in Austria under 21s’ 3-0 home win on Friday over Turkey.
Reds defender Aapo Halme captained Finland under 21s in both their 4-0 win over Malta on Friday and their 1-0 loss at home to fellow Nordic country Denmark on Monday.