The 25-year old joined Marseille on a season-long loan in August – with Florian Thauvin arriving in his stead – but has so far failed to produce upon his return to Ligue 1.
Cabella recognised his performances haven’t been at the required level, and has vowed to put things right.
"I know that bit by bit I'll get there because it's true that I'm lacking rhythm,” he told reporters from Le Phoceen TV.
"It's up to me to rediscover my confidence and that'll happen with some good performances and game time.
"What I need is to play and maybe to create a goal or to score... That way I'll get my confidence back and start enjoying myself on the pitch again because it's true I lost a bit [of confidence] as a result of last year."
The Frenchman arrived at Newcastle last summer for £10 million – according to the the Telegraph - after several successful years with Montpellier and was highly-rated in his homeland.
His switch didn’t go to plan however, and he failed to adapt to the demands of the English game, scoring just once in his 34 appearances.
Florian Thauvin has so far failed to suggest that he will be an upgrade on Cabella, and the Magpies hierarchy may well steer clear of the French league should their latest signing be unable to make the grade.