Britt Assombalonga converted from the penalty spot to notch is 16th of the season in all competitions, before John Obi Mikel bagged his first goal in Boro colours. 

Michael Smith dispatched from 12 yards for the Millers in the second half, but results elsewhere meant Boro narrowly missed out on a Play-Off berth. 

Go behind the scenes at the New York Stadium with Inside Matchday above.