Luke O'Nien has today finalised his transfer to fellow League 1 side Sunderland, ending a three-year stay at Adams Park.
The club accepted an offer from the Black Cats on Friday and the midfielder travelled north at the weekend to complete the move.
Boss Gareth Ainsworth said: "It fills me with immense pride. I am devastated at the same time but proud because for a club like Sunderland to come in for a player who was on trial with us three years ago just shows what a fantastic journey he has been on.
"But if anyone deserves it, it is Luke O’Nien. He works his socks off. He’s always the last one in from training every day, he does his stretches, he does his work in the gym, he very rarely gets injured unless it is an impact injury and he is an example to all young players of how to make the best of who you are and what you are.
“I wish him all the best at Sunderland. I wish he was still at Wycombe but we will watch his career with great pride, as we do with Alfie Mawson, Jamal Blackman, Ebe Eze - players who have come in and gone on to do fantastic things," he added.