The pair were second-half substitutes in Sunday's final day win at Leeds United.
“I'm really proud for myself and everyone who has been involved in the journey along the way," Craig told the club's website. “As a young boy, everyone dreams of making their Premier League debut some day and I'm lucky enough to do it.
“Every day that you're in the building, it's just working towards getting over into the first team and I think I've tried to do that as much as possible this year, and also in the past as well. On a personal note, I'm happy because it feels like the culmination of everything you do every day. George has worked really hard this year as well and I'm pleased for him too."
Abbott also said: “Of course, it's a major step up from Under-18s football.
“I think you have less time on the ball here, we've been training with the first team now and again so we know what it's like but just to get that moment… it's a big achievement.
“It's a very proud moment for me and my family. Everything I've put into this… I'm just really happy to make my debut. The Leeds fans are obviously known for being loud, it was a bit nerve-wracking getting on but after that I thought I got into it, calmed down a lot and it was a good experience."