Keeping worries for Bees Barnet have a goalkeeping crisis ahead of the visit of Exeter. Graham Stack is suspended after he was sent off for a professional foul during Saturday's 2-1 defeat at Fleetwood, while Liam O'Brien is still recovering from a hernia operation. If O'Brien is not fit enough 19-year-old Sam Cowler, who came on as a sub at the weekend, will make his full Bees debut. New striker Ishmail Kamara came on for his first appearance at Fleetwood but lasted only a few minutes before suffering a dislocated shoulder which saw him end up in hospital, so he will not be available. Former Fulham frontman Collins John joined the Bees last week but will probably need more time to build up his fitness. Exeter boss Paul Tisdale will be without the services of Scot Bennett. The midfielder was taken to hospital after being stretchered off during Saturday's defeat to Bristol Rovers. It was initially feared the 21-year-old had suffered a broken leg but X-rays showed there was no fracture. Bennett will visit a specialist on Monday for a full assessment of the injury as Tisdale awaits news of when he may return. Jimmy Keohane and Jacob Cane are likely to battle it out for the now vacant position in midfield. Striker Alan Gow also limped off in that fixture after taking a heavy knock to his ankle and there are concerns over his fitness before kick-off. Gow is a major doubt for the visit of Vale with Guillem Bauza or John Flynn likely to partner Jamie Cureton up front.