Ba is being linked with a lucrative switch to Galatasaray.
But Supermac told the Evening Chronicle: "The Newcastle fans deserve to know what his plans are.
"The real fans are entitled to that at least.
"If he is going to carry on like this then to me it shows his only desire seems to be purely and simply money.
"If he is chasing money and not success that's a sad situation because if you are successful the money and the other rewards will come to you anyway.
"Signing big and better contracts is just the lazy way of doing it."