Striker Sam Greenwood admits it was a "very hard" decision to leave Sunderland after securing a move to Arsenal.
The promising 16-year-old was in demand with Manchester United and Liverpool also keen on the teenage forward.
The Gunners won the race to land his signature and Greenwood has opened up about the decision to leave Wearside.
Writing on his Instagram account, Greenwood said: "Today is the start of a new chapter in my life signing for @arsenal and I can’t wait to get started, I’m looking forward to the challenges ahead.
"Leaving @sunderlandafcofficial after 10 years the club I love and support was a very hard decision, I have met some special people along the way.
"Big thanks to @sunderlandafcofficial and all coaches past and present for everything they have done for me . I will never forget my roots. #murtonbornandbred #sunderland#redandwhitearmy #arsenal #gunners."
Greenwood enjoyed a successful season for Sunderland's Under-18 side last season, scoring six goals in 15 appearances.