The Canadian-born Dutchman has arrived at the Liberty Stadium on a season-long loan from Villarreal after being plagued by injury last term.
The 24-year-old previously worked with new Swans boss Michael Laudrup at Getafe and admitted he needed little convincing in making the move to south Wales.
But the pressure on De Guzman to deliver has been amped up by the sale of Wales international Allen to Liverpool for a £15million fee a week ago.
Allen was one of the star performers as Swansea finished 11th last season, and during pre-season De Guzman has filled the Welshman's role alongside Leon Britton in midfield.
But De Guzman has little doubt he can deliver, starting against Mark Hughes' Rangers' side at Loftus Road.
"Joe had a very good season last year and I'm filling his shoes, but I don't feel any pressure," he said.
"I know what my capabilities are and hopefully I can contribute this season.
"It's going to be very exciting to play a game against Queens Park Rangers on Saturday.
"I haven't played for more than a season now. I didn't do much at Villarreal, but that's in the past.
"It's a new beginning, I'm starting for the first time in the Premier League and I'm happy to be here."
Swansea's impressive maiden Premier League campaign was based on a sound defence that kept 14 clean sheets in total.
But, despite their attractive passing game, they were accused of lacking a cutting edge in front of goal.
De Guzman's creativity saw Villarreal pay seven million euros for him just a year ago, and he hopes he can set up plenty of chances for the likes of striker Danny Graham.
"I'm a creative player who supplies the passes. Scoring goals is a bonus," he said.
"Myself, Leon and Michu, our job is to get the ball forward to create some chances for the forwards.
"The game is all about scoring and we need to make our mark on the Premier League, and that will be more difficult than last season now everyone knows what Swansea is all about.
"It's not going to be easy, but with the group we have, I think it should be a good season."
De Guzman is one of five new arrivals at the Swans so far this summer, along with Michu, Chico Flores, Itay Shechter and Kyle Bartley.
But Scott Sinclair's decision not to sign a new contract has rocked the club less than 48 hours before the season starts.
The south Wales side are thought to be close to a deal to bring in Valencia's Spanish international winger Pablo Hernandez, and De Guzman believes he would be an ideal replacement with Sinclair likely to be sold before the end of the transfer window.
"He would be a great signing. He's a very good player, creative and fast," said De Guzman.
"I've played against him in La Liga where he was one of the key players for Valencia
"Every time I saw him play he impressed me.
"He's creative, he's fast and he can score goals from the left wing."