Defender Ramsden, handed the captain's armband in the summer, has made only three appearances this season due to a hip-related calf injury, while midfielder Flynn has appeared only once as he has been recovering from a double hernia.
Manager Peter Taylor said: "I know Flynn's been doing really well recently and now I believe he's caught Simon up.
"I've got no doubt that both of them will be available maybe mid-to-late January."
Ramsden had surgery to resolve his problem in October and Flynn has undergone two operations, one in the summer and another in the autumn.
Source: PA
Source: PA