The 27-year-old has been in discussions with the Football Club throughout the summer as his contract was set to expire at the end of this month. The left-back, who is now entering his 10th season with MK Dons, has committed his future to the Club until June 2015.
Lewington, the Dons’ longest serving player, made his 400th career League appearance last season and was once again a regular on Karl Robinson’s team sheet until injury ruled him out at the end of the season.
Fit again, Lewington linked up with his team mates on Monday as the squad returned for pre-season training and will head to Dublin with the rest of the squad later this week.
The former Wimbledon defender has been always been a key figure in the MK Dons side and in 2008 he was handed the captain’s armband, which only strengthened his leadership on the pitch and behind the scenes.
Speaking to mkdons.com, Lewington said: “It has been pretty close for the last two or three weeks so it is nice to know where I am going to be for the next few seasons and I’m glad it is all sorted.
“It took a little longer than we would have all liked but at the end of the season you disappear off on your holidays and before you know it a few weeks have gone by. It probably dragged out a little longer than it needed to but we were talking and I was always confident of signing.
“It’s nice to say I am part of this now; I can really focus on pre-season and kicking on with the season ahead. It will also help the Gaffer with his plans for the team too.
“It’s probably the fifth or sixth contract that I have signed and now it says ‘2015’ which makes me feel quite old! It’s great to be a part of it and hopefully we can take the Club where it wants to go.
“It’s my 10th season so a testimonial is on the cards, but it will take a little while to work out and hopefully come Christmas I might know what we will do.”
His manager, Karl Robinson added: “I’m ecstatic that Dean has signed, he is this Club through and through. I never thought at any stage that he wouldn’t be here next season.
“He is a tremendous asset to this Football Club and one of his ambitions is to play in the Championship with MK Dons. He deserves all of the plaudits that he gets and I hope one day he gets the success that his loyalty deserves.
“In modern day football it is a great achievement to be heading into his 10th season with MK Dons, but knowing Dean as a character it doesn’t surprise me. He has a dream and a goal with this Football Club, he has started it and he wants to achieve it.”