The R's are currently in 16th place in the Premier League table after taking just three points from their opening four matches of the campaign.
Vargas, who made his debut during Sunday's 4-0 defeat to Manchester United, believes that QPR must remain positive if they want to turn their fortunes around.
"Obviously I'm saddened by the result for myself and for the team," the on-loan signing from Napoli told the club's official website.
"On the pitch I felt fine but we have to keep working and I have to get to know my teammates better. We are a good team and we just need to keep on working."
QPR continue their Premier League campaign on Saturday when they welcome Stoke City to Loftus Road.