The defender joined the Rs from Russian side Anzhi Makhachkala on deadline day of the January transfer window for a fee of around £12.5 million.
The 28-year-old then made his debut two days later in the 0-0 draw against Norwich at Loftus Road, the club's fifth clean sheet in seven league games as they undergo a mini-revival under Harry Redknapp.
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Despite the recent run of decent form the west Londoners remain six points away from safety with just 13 games left in the season, but Samba is sure they will beat the drop.
"I have seen for myself now we have enough to remain in this league," he told reporters.
The solid performance against the Canaries was all the more impressive since the Congolese had just enjoyed a five-week break due to the Russian league's close season.
The former Blackburn man admits he needs to work hard on his fitness, due to the prolonged break and the intensity of the Premier League, while he was not satisfied with just a point.
"I'd only done five days of training after five weeks out before coming here," he added.
"This is the English league and it is physical. It was a more intensive style of play than it was in Russia.
"To get a clean sheet against Norwich was pleasing but I was very disappointed to get a goalless draw as a win would have put us back amongst the chasing pack."