John Fleck has signed a new long-term contract to extend his stay at Bramall Lane until 2023.
The midfielder has again been in sparkling form this season, being one of United's standout performers on our return to the Premier League.
The 28-year-old has been a major success story for boss Chris Wilder after joining the Blades in 2016 from Coventry City on a free transfer, when the club was still in League One.
The former Rangers dynamo was named Player of the Year in his first full campaign as United clinched the League One title, and he was also named in the PFA League One Team of the Year.
After being crowned Player of the Year a second time the following year, his consistent displays helped United clinch promotion to the Premier League in 2018-19.
This season he has again excelled, netting five goals so far, whilst he also earned his first cap for Scotland against Russia in a Euro 2020 qualifier.
On the announcement of his new deal, Fleck told www.sufc.co.uk: "It is an amazing club. It is one that I always wanted to be part of going forward. I've really enjoyed my time here since day one, so I didn't see any reason why I wouldn't want to be here at what is a really exciting time for the club.
"We have been very successful since the manager came in. Everyone has worked hard and had a good time here; it has been a great club to come to and I am delighted to be extending my stay."
Boss Chris Wilder added: "He's been instrumental and amazing in the way he's stepped up through the divisions with us on our journey.
"We want to keep our best players at the club and John is certainly one of them, so we are thrilled to get this one done.
"His progression has been outstanding in terms of his performances through the divisions and now he's doing it at the highest-level week in, week out and also gaining the recognition for his country as well."