9:13 AM PT -- Matt's wife, Kelly, says the couple selling off their home has NOTHING to do with Stafford's football future ... claiming the listing is purely to keep their kids safe from all the water surrounding the home.
"No speculation is needed," said Kelly, who's pregnant with the couple's fourth child. "We're about to have our fourth child and I, personally, do not want to live on a lake or have a pool with four children under the age of a little over 3."
Kelly added, selling the house is "super sad," but reiterated, it's necessary for their family's future.
"It just makes us feel better knowing that there's no real dangers of having tiny ones running around all the bodies of water," she said.
Detroit Lions QB Matthew Stafford's insane mansion -- featuring the LARGEST infinity pool in Michigan -- is hitting the market with a $6.5 million price tag!
The 1.27-acre home is as baller as it gets -- 5 beds, 7 baths and sits on a peninsula looking over Upper Long Lake, a glass elevator, indoor basketball court with the Pistons' old Silverdome hardwood, walk-in wine cellar, gourmet kitchen, walk-in closets, sauna ... and, oh yeah, the infinity pool.
Seriously, even the marble bathroom sinks are dope.
Listing the Bloomfield Township crib (30 minutes from Detroit) is extremely interesting because it comes fresh off rumors Stafford asked the Lions for a trade ... which he denied Thursday.
"Listen ... I’m here, I want to be here," Stafford told reporters. "I love being a Detroit Lion, I love leading this team."
"It's a slow news month at that point and I’m just happy to be where I am and ready to deal with this off-season the way that it is and try to make the best of the season that I hope happens."
Stafford, his wife, Kelly, and their 3 kids have other homes in California and Georgia ... but it's unclear what his plans are in the Great Lake State.
But, for a guy who's reportedly made more than $200 million in his career ... we're sure he'll find a place.