Ba, who scored the winner against Manchester United in the quarter-final replay, came off at half-time of the weekend's 2-1 win over Sunderland with an ankle injury but is expected to take hid part on the weekend.
The Senegal international is cup-tied for Thursday night's Europa League meeting with Rubin Kazan but interim boss Rafael Benitez says he will be fit for Sunday.
"Demba Ba did not train today, just as a precaution," he said.
"It's not too serious. He will not go to Moscow. Hopefully he can train here and be okay for the weekend."