Manager Steve Burr said:
"I'm pleased Oliver has decided to stay with us. We like how he goes about his business and have been impressed by him since he rejoined the club. He is a young, fit & athletic lad who has plenty of promise.
I know it's frustrating for him, as it is with all the lads, not playing games regularly with the postponements, but, following the change of weather, we are about to embark on a heavy run of games over the Christmas period. We will need every man in our squad to perform when on the pitch and take as many of the points on offer as possible."
Celtic head into Saturday's crucial game against Rushall Olympic 23rd in the table, having not played at home since the FA Trophy tie against Rushall. Home comforts will certainly be welcomed.