Patriots owner Robert Kraft is "still intrigued" by the prospect of buying a Premier League club but has concerns about the absence of a salary cap.
Kraft, 76, has overseen five Super Bowl wins since purchasing the Patriots in 1994 and also founded MLS side New England Revolution.
The billionaire came close to buying Liverpool in 2005 before the takeover by Fenway Sports Group, which also owns the MLB Red Sox.
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Kraft confesses he is still open to investing in a Premier League side though the lack of restrictions on wages makes it difficult for him to see clear benefits.
"I like to win at whatever I do," he told BBC Sport. "But without a salary cap I'm concerned that we might be at a disadvantage.
"We helped found MLS in America. Our league here is starting to really develop, and with our soccer team we've gone to the championship game five times in 21 years.
"I'm just concerned in the Premier League that we might not, with all the different ways of operating, we're not as familiar with all of them.
"Let's say people from all over the world come in and buy teams and maybe they have different reasons for doing it and managing it. And you have to compete with that and I'm not sure. But I'm still intrigued."