The team has not yet commented on the reports, though NFL.com's Ian Rapoport is reporting that early estimates say Gronkowski is expected to be out 4-6 weeks.
According to ESPN's Adam Schefter, the injury might have occured on the final extra point of the day with 3:55 left to play when the Patriots were leading by 34 points. For the record, tight ends Visanthe Shiancoe and Michael Hoomanawanui also were active and played Sunday.
In Sunday's win, Gronkowski caught seven passes for a game-high 137 yards and two touchdowns, and via ESPN Stats, Gronkowski became the first tight end in league history to record 10 or more touchdowns in three-straight seasons. Tight end Aaron Hernandez, meanwhile, hasn't played in three games because of an ankle injury, though he's had limited participation in practice lately.
Gronkowski was not available in postgame interviews and did not speak with reporters.
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