Ba joined the Hammers from Hoffenheim in the January transfer window.
The Senegal international scored twice in the draw with West Brom last week.
“He is a very good player. I followed him for a long time in the German league,” said the Israeli coach.
“He always scored, he is always moving. It is very difficult to mark him and he hits the target. That is what you want from a striker.
“Those are the most important things for a striker – movement and being able to hit the target – and that is what he did against West Brom.
“I think they cleared off the line from him twice last week.
“He can play anywhere – right, left, behind. He is good and he is not in the best shape yet because he had a break from 21st December and we are building him slowly, slowly.”