Exeter boss Paul Tisdale will be without the services of Scot Bennett when they play host to Port Vale.
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.