The Dutchman had a successful loan spell at Swansea last season.
"My ears are always open," said De Guzman when asked if rejoining the Swans was a possibility. "I had a great year there. The people around the club and the fans treated me well.
"It was not just the results we had, it was more about showing we can also compete with the big teams. We played better against the bigger teams.
"We played well in a lot of games. We played good football and it's refreshing playing in a team that has a good football mind.
"I'm very satisfied with what happened. We did very well - we were very creative. We really put Swansea on the map."