The former Vitesse Arnhem striker made his move to the Liberty last week.
"He's a goalscoring striker. That's what we missed last season. I think he is happy to play with us because we play good football. With Bony there, we can score even more goals.
"The English league is more physical than what the Dutch Eredivisie is," says De Guzman. "But he has shown he can handle it. I think he is a very big gain for us."