He scored in the friendly against Ghana last week and he came on in the game against Bolton on Saturday and looked sharp.
Ince said: "Benni came back to pre-season not quite right. He's had to work really hard to get himself to the weight he needs to be at.
"He has had a couple of games for South Africa and that has helped him. He seems to have that hunger back.
"Benni has been razor-sharp in training and he did well when he came on in the last 15 minutes against Bolton. He gives me another selection problem but that is what I get paid for.
"It is nice because Benni is a quality player and when he is right he is one of the best in the Premier League."