Ba, a Senegal international, was back in Newcastle colours as the days tick by towards the July 31 deadline on his £7million release clause.
The striker, who has been linked with Manchester United , Liverpool and Turkey's Galatasaray, could leave at the end of the month but began training after tweeting: "So much stuff about me lately. Rumours are rumours! Just forget about it.
"By the way I had the best holiday ever."