The Swans edged closer to securing their place in the top flight with a 3-0 victory over Norwich City on Saturday.
The Welsh outfit are now seven points above the relegation zone in the table with six games left to play.
"Until mathematically we are safe we are going to fight until the end of the season," BBC Sport quotes Rangel as saying. "We are not safe but obviously it's a big win. A big step forward for us.
"It's an interesting and competitive league this year. I think it's been hard for everyone, even for us. We've got to stay on our toes now and keep working.
"Hopefully after the next few games we can say that we are still a Premier League team for next season."
Swansea will take on Hull City at the KC Stadium this weekend.