The defender was signed on loan from Leicester City in January.
The defender joined the Championship side on loan until the end of the season on deadline day of the January transfer window.
However, there were rumours that his parent club could cut short that spell and recall him for their remaining games this season.
That has not happened as yet and Karanka insists De Laet is pleased to be at Boro, hailing him for his amazing attitude in the process.
“He is really pleased to be here,” he told the Gazette.
“He is helping us a lot, he is the kind of player who is a good example for everybody.
“He’s come from the Premier League and he is playing in a position that is not his position, he can play better and he can play worse but his behaviour on the pitch, his attitude on the training ground and in the changing room is amazing.”
De Laet will now be hoping he can use both his Premier League and Championship experience to help get Boro out of the second tier this season.
They are currently third in the table with 58 points to their name, a point behind Burnley in second and two behind leaders Hull City.
That means a place in the top two is very much up for grabs, and the on-loan man could be crucial in their attempt to make of them their own, having been a part of Leicester City’s promotion winning squad in 2014.