Boro going behind the scenes as they confirm their end-of-season play-off spot with a 2-0 victory against promotion rivals Millwall at the Riverside.
The hosts were ahead when £15m club record signing Britt Assombalonga was on target for the second successive game after finishing well inside the near post.
Midfielder Jonny Howson then took advantage of a mix-up between goalkeeper Jordan Archer and defender Jake Cooper with more than an hour played.
The Teessiders complete their league programme this weekend at Ipswich Town before turning attention towards the play-offs, where Aston Villa are appearing their more likely opponents.
Derby County could yet pinch fourth place from them and will fancy their chances at home to Barnsley – in which case it would be either Fulham or Cardiff City.