Boro boss Chris Wilder paid tribute to the club's support after 6,000 travelling fans watched the final day defeat at Preston North End.
"It's an incredible support that we’ve had all season, and especially at Preston," said the boss.
"That support was incredible and humbling. That was a statement of love for their football club.
"I thank them for their support at Preston and since we’ve come in. They’ve been an inspiration. Now it’s up to me to deliver more of what they want to see next season.”