Gudjon is waiting on the fitness of leading scorer Dean Gorre and midfielder Chris Lumsdon before naming his side for tonight's game at Oakwell where a win would see the Reds climb to second place.
Rory Fallon and Steve Hayward came off the bench on Saturday and could be recalled to the starting eleven.
The Wrexham line-up is likely to include former Res striker Lee Jones and experienced keeper Andy Dibble.