The 27-year-old Belgian made 12 league appearances for the Foxes before joining the Tees-siders on loan for the rest of the season.
His parent club - Leicester, currently hold a seven point lead over second placed Tottenham Hotspur, while Middlesbrough sit three points behind Championship leaders - Burnley, with a game in hand.
It would be a fantastic story if the former Stoke City player could win both medals, although there is a long way to go yet.
De Laet has played five times for new club Middlesbrough, helping them keep two clean sheets, whilst also registering an assist.
It is now a distinct possibility that the speedy full-back's name will be written into history, and along with that, a legacy forged that would not have seemed possible just a year ago.
It would be an achievement that may surely never be repeated.
Next up for Leicester is a trip to Sunderland, while Middlesbrough host Huddersfield as they look to close the gap on the league leaders.