Defender Mark Phillips admits he probably returned to the Southend starting XI too soon.
The centre-back limped off during United's 2-1 defeat to Aldershot on Tuesday with a recurrence of a troublesome groin injury.
"To be honest I think I am struggling with my groin still," Phillips told the official website.
"I don't think my performance was up to standard but I think my groin is holding me back.
"I'm going to have to reassess it and see where I go from here.
"Possibly in hindsight it was too soon but we are all here to put a shirt on and give it out all."