The Nigerian international has been poor this season.
Unfortunately, they also fluffed their lines.
Goals from Atde Nuhiu and Will Keane did the trick for Sheffield Wednesday at Hillsborough, as Boro's blip continues.
They have won just once in their last five games, after winning their previous six.
The Nigeria international was with the club for half of last season and was fantastic for Aitor Karanka's men. With that in mind, Boro fans were more than happy to see him return to Teesside in the summer.
However, this season has been far less impressive and Saturday was perhaps his worst performance of the campaign yet.
He gave away the penalty and was a liability throughout proceedings in Yorkshire. Then, when subbed off in the 58th minute, he stormed down the tunnel in a huff.
Omeruo once looked like one of the best prospects to make it at Chelsea, after starring for Boro and his Nigerian national team.
Now he looks far from the standard required to make the grade.
Here is some of the best reaction on Twitter to his performance for Middlesbrough...
Omeruo has been so bad this season, it's a shame bc he was amazing last season— ️dana (@VivaKaranka) February 28, 2015
type in 'Omeruo liability'. pretty much tells you everything you need to know— Harry Bond (@KarankaIsBossen) February 28, 2015
First half today Kalas different class. Got Gibbo out of a couple sticky situations. Omeruo was awful & wasn't interested out on the right— boroborn1983 (@boroborn1983) February 28, 2015
I dont ever wanna see Omeruo, Forshaw, Husband or Whitehead start again in last 12 games. Could of strangled the 4 of them today— Jordan Daniels (@JDrSteelhammer) February 28, 2015
Who has disappointed you the most this season? I would have to say Adomah and Omeruo have been woeful compared to last season..— Jackkk (@jpeart7) February 28, 2015
Well said Karanka. At least he was man enough to admit he was wrong. Still think Omeruo has not played well this season. @bbcteessport— Portmid (@Salty765) February 28, 2015
Omeruo went straight down the tunnel... that's him not in the squad on Tuesday— Cameron Park (@campark2) February 28, 2015
Match summary: - Omeruo back to Chelsea please - Strikers can't strike - Worst performance of the season— UberBoro (@UberBoro) February 28, 2015
Don't know what's happened to Omeruo, was a class apart last season but has looked completely different this time around #borolive— Andrew Bell (@andybell95) February 28, 2015
It has to be asked. Kenneth Omeruo, What Has Happened To You? #borolive— Si's Insights (@sis_insights) February 28, 2015