Kirby signed a professional deal with the Eagles in February 2017, having previously on the books of Tottenham Hotspur, and was a member of England's victorious FIFA U17 World Cup-winning squad later that year. He played in six of the Three Lions’ seven games in India, scoring the crucial penalty in a shootout win against Japan in the last-16.
In the summer of 2018 Nya appeared in the UEFA Under 19 Championships in Finland, while at club level he has featured in a few pre-season friendlies for Palace including the 2017 Premier League Asia Trophy in Hong Kong, was named on the first-team bench against his former club Spurs in February 2018.
Speaking about his deal, Kirby said: “I see this as an amazing achievement and I am very excited to have the chance to sign this new contract. I know though that the hard work starts here and I need to keep working on my game to give myself the best opportunities for the future.”
Chairman Steve Parish also commented on the signing, saying: “I am delighted that we have been able to sign Nya to a longer contract. We are a club who has a proud history of bringing young players through the ranks, and this is another deal that shows our commitment to continuing that tradition.”