Franks said: "This is the ideal chance to get out and try to play a few games.
"Centre-half is a difficult place for a young player to get a chance but I have come here looking for the opportunity to show what I can do."
He added: "As a player you've got to strive to improve, whether you're on trial or not. There is always pressure to perform in every game.
"You are judged on your last match no matter what and I want to approach things positively. You have to aim as high as you can and although I know it's not going to be easy holding down a place I'm looking forward to the challenge ahead."
Source: BBC Sport
Source: BBC Sport