Bigirimana's move was confirmed by the Magpies on Friday afternoon, and follows the arrival of French midfielder Romain Amalfitano.
He told NUFC TV: "It's a dream, it's a dream for me. Since I was a kid, I always watched the football - the Premier League and also big leagues - and I always hoped that one day I would make it.
"But I didn't realise it would be this soon, so it's an exciting moment in my life and a challenge which I am looking forward to."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!