Le Roy's magic touch at the tournament has continued this year, with the 66-year-old reaching the knockout stages for the seventh time in eight attempts - achieving that feat with five different nations.
Congo qualified as Group A winners after Fabrice Ondama struck a late winner to consign Burkina Faso to a 2-1 defeat on Sunday.
He told Canal+: "It's incredible.
"I feel a lot of emotion and incredible happiness. These guys are incredible.
"We have come from nowhere. We knocked out Nigeria, the reigning champions [in qualifying].
"And now we have beaten Burkina Faso, who were runners-up last time.
"Anything that happens from now on is a bonus."
Almeria forward Thievy Bifouma has scored two of Congo's four goals in Equatorial Guinea..
DR Congo are ranked four places higher than their opponents by FIFA but have not won a match at the tournament so far.
Three draws were enough for DR Congo to qualify for the last eight, with Jeremy Bokila's 66th-minute effort ensuring they held Tunisia 1-1.
The two sides last met in qualifying for this year's tournament - back in 2013. DR Congo won the first clash 2-1 before Congo hit back with a 1-0 triumph.
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