De Guzman spent last season on loan at the Liberty Stadium and Swans chairman Huw Jenkins has confirmed that the midfielder will be remaining in South Wales next term after agreement was reached with his parent-club Villarreal.
"Everyone is happy the loan is continuing," Jenkins told swanseacity.net. "Then Jonathan will review his long-term future next summer."
De Guzman scored eight goals last season as the Swans finished ninth in the Barclays Premier League and won the Capital One Cup and he is aiming to continue that progression come August.
"I had a great year at Swansea," said the 25-year-old.
"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."