The Magpies are believed to be closing on the 23-year-old midfielder's signature after a lengthy chase.
Cabella's father, Hector, recently claimed that a transfer is likely to be pushed through during the January window.
He told Actuafoot: "Yes we are negotiating for Remy and yes he will join Newcastle this winter."
Montpellier, though, have yet to confirm that an agreement has been reached and Courbis claims to have been blocked from discussing the matter.
He is, however, prepared to offer an opinion on the standards Cabella should be setting - and feels he is worth more than the figures being discussed at present.
Courbis told BeIN Sport after leading his side to a 2-0 victory over Sochaux on Saturday: "(Owner) Louis Nicollin, Remy and his family will decide what is best.
"With the amounts currently being discussed, I think Louis is a good enough trader to make the right choice.
"I do not think that Remy Cabella can be transferred for this amount when compared to the ridiculous numbers discussed for (Yohan) Cabaye. It would mean that Louis is mad. I meet with him every day and that is not the case."