And players and managers use it all the time. It's obviously a word that seems to have lodged in people's minds, so maybe they should bring it back.
But until they do, it's incorrect. And pedants like me will carry on pointing it out.
I will certainly be pedantic about the OP referring to 'Premiership' millions. We are not in professional rugby or Scottish football. It's the PREMIER LEAGUE FFS. Is it really so difficult?