Speaking to the Official Club Website, Magilton admitted: "It's looking doubtful for Saturday at the moment. The scan showed a small tear, it's nothing major but there is obviously the risk of making it worse.
"We will see how it goes and what the boss thinks. I desperately want to be out there on Saturday but we have a lot of games at the start of the season and I don't want to risk making it a lot worse and end up on the sidelines for weeks."
Check out ITFM on Thursday as we go behind enemy lines to talk with Gillingham fans about the season ahead, Iwan Roberts and Saturdays game.