NFL Network Insiders Ian Rapoport and Tom Pelissero reported Monday that tests confirmed Jones suffered a "pretty severe" high ankle sprain, per sources informed of the situation.
The current hope is Jones can avoid surgery and he's getting a second opinion that will further clarify his timeline to return.
Jones told reporters on Monday afternoon that he is taking his status day to day, but that any specific injury questions should be directed to Patriots head coach Bill Belichick. Jones reiterated that stance when he asked if surgery was a possibility.
"Definitely any updates, you can talk to coach about," Jones said, per NFL Network's Mike Giardi.
Jones was injured on his final throw of Sunday's loss -- an interception -- when Baltimore defensive lineman Calais Campbell landed on his ankle while hitting the QB. Jones limped off the field in obvious pain and immediately went in for tests.
Belichick was mum when asked about Jones' status earlier Monday morning, saying he wouldn't make "wild speculation" until further tests came available.
Jones has displayed toughness in his young career, but the ankle injury makes it hard to imagine he'd suit up this week versus the Green Bay Packers. Depending on the outcome of the second opinion, injured reserve could be an option, which would knock the signal-caller out for at least four weeks.