Jordan Rhodes has scored one goal in 10 appearances for Middlesbrough.
Rhodes joined Boro from Blackburn Rovers in the January transfer window, but he has struggled to make an impact at the Riverside Stadium.
The 26-year-old has scored just once in 10 appearances for Middlesbrough, and his form has not looked up to scratch.
However, Karanka insists that the Scotland international will come good - and he has backed Rhodes to find his scoring groove soon.
“If you look at the statistics most of the time we have something like 60 or 70% possession,” Karanka said.
“So with him (Rhodes) up front we are going to be really, really dangerous because if he is playing and behind him are (Albert) Adomah, and (Stewart) Downing and Gaston Ramirez or (Cristian) Stuani, all of them are good players so for that reason I am really calm because if Jordan has scored goals in the past I’m sure he will score goals with us.”
Rhodes has always scored prolifically in the Championship before, but he has failed to enhance Boro’s attacking threat yet.
Karanka will be relying on the predatory forward to start hitting top form soon, though, as his side go for promotion.
Middlesbrough are currently in third place in the Championship table, but they do have a game in hand over many of their promotion rivals.
Boro’s next match comes against Queens Park Rangers at Loftus Road after the international break.