Newport County left-back Adam Lewis will be sidelined until the New Year.
Lewis' injury is another blow to manager Graham Coughlan as he copes with a "hurricane" of fitness problems.
The 23-year-old Liverpool loanee is likely to return to his Premier League parent club for rehabilitation on a thigh injury, having also had his loan curtailed last term because of fitness.
"It's a similar injury but on the opposite side to last season," Coughlan said.
"It' s a really bad one and a tough one to take."
Coughlan was forced to name a six-man bench for the 2-1 League Two win over Colchester United on Tuesday.