"I have to say they have surprised me," Allardyce said.
"If you have one or two doing it from the start, particularly from abroad, then you are satisfied - but all of them have had an impact.
"We all know about Songy and he is not even fit now - when he gets fit we will see even more from him."
Allardyce continued: "We have a very welcoming dressing room for new players here. (Captain) Kevin Nolan builds a strong bond between the players and because of that togetherness and because we try to do as much as we can for the players, they grow willing."
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