The left-back, 23, dogged by a succession of injuries in the last 16 months, has made several 90-minute appearances for the reserves in recent weeks and is one of a number of players keeping those currently in the starting line-up on their toes.
Parker said: "I'm feeling pretty good in myself. Over the past month I've felt as good as I have done for a long while.
"I've gradually eased my way back into training and matches. I felt strong on Tuesday and I'm getting 90 minutes under my belt now which is good.
"I've played quite a few games and am getting plenty of match practice. I went a long time without a game and at my age you want to be playing games."
Parker added: "The players who are in the first team know that we've got a good squad and know that they have to perform because there are players who can come in."
Source: PA