Doubts were cast over the Toon’s capabilities after they lost their opening two games.
Rafa Benitez has splashed out £45m to reshape his squad following relegation in May with Ritchie one of nine new arrivals.
And more will follow in the next fortnight with FC Utrecht striker Sebastien Haller the latest player on Benitez’ radar.
Newcastle head for Bristol City this weekend with Ritchie convinced Wednesday’s win can spark a climb up the table.
“There were some big question marks over us after the two defeats but we’ve answered those,” said the former Bristol City winger, who opened his Toon account with a sweetly struck penalty.