Pardew believes that 18-year-old Bigirimana will continue to get "better and better" as the weeks go on following his promising Premier League debut against Aston Villa.
He told the Evening Chronicle: "It was a tough game to come into.
"He came in at a time when we weren't playing well.
"That is difficult for a young player.
"I hummed and harred about sticking him on if I am honest. But he was terrific."