2:07PM BST 07 Jul 2011
Ba failed a medical at Stoke City in January before signing for West Ham because of an old knee injury, but the striker is adamant there is no problem and intends to prove it at St James's Park.
Although Ba has not taken the number nine shirt choosing number 19 instead - vacated by Carroll when he joined Liverpool for £35m just over six months ago, he is expected to pick up the goal scoring burden, particularly as Newcastle's £7m offer for PSG striker Mevlut Erdinc has not been accepted.
It is a challenge he is relishing, not just to win the hearts of fans still pining for the England international, but also to bring an end to months of doubts about his knee.
'I am fed up with it, but people will probably talk about it all my life,' said Ba, who signed for Newcastle as a free agent from West Ham following the Hammers relegation to the Championship.
'I will prove there is no problem. You can't stop people talking, let them talk. I am fit and healthy. They will only stop asking about it if they see me playing and scoring goals. Look at the stats from West Ham last season and I did that. I will let my football do the talking.'