Rob Gronkowski has just one catch for 11 yards in two games since returning from a hamstring injury in Week 3.
Gronkowski's hamstring remains an issue, according to a source.
"How are you guys not paying more attention? This guy is not right," the source said. "That hamstring has not come along like they thought it was going to."
The New England Patriots have primarily used Gronkowski as a blocker, while limiting his route trees to areas near the line of scrimmage.
Gronkowski conceded as much on Wednesday, telling reporters the hamstring is "obviously" holding him back.