Argentine Civelli damaging ligaments in his knee during the recent home clash with Burnley, and after just eight games for the club, will not return to training until the next calendar year.
As Magilton told the EADT, he aims to bring new blood in: "It is a position we wanted to strengthen and we thought we had the answer. We will be making moves to bring in someone else.
"Luca gave us lovely balance and there is so much more from him to come. We are looking for another left-footed player to play out there but there are not many around."
Click here for a full player profile along with match stats on Luciano Civelli.