Callum Kennedy is still training with AFC Wimbledon despite being told he was surplus to requirements at the club.
However, the full-back remains part of the camp at New Malden in order to maintain his fitness.
Ardley brought in Jack Smith this week after he was let go by Millwall but has refused to rule out a shock return for Kennedy should he fail to find adequate cover.
He said: "Callum missed most of the second half of the season with an ankle injury, so I said he could come back and train with us to get himself fit.
"We are looking at a couple of others in training and Callum has a few options himself, but if things don't work out then you never know."