Rob Gronkowski's slow return from offseason surgeries is creating tension among his New England Patriots' teammates, according to sources.

"There's curiosity and resentment, and he's creating it by going out and kicking ass during the week and then he doesn't show up on game day and help the team win," one source said.

Gronkowski may be concerned that another injury to his forearm could threaten his career.

Gronkowski, however, has practiced fully for weeks and was described as dominant ahead of the Patriots' Week 6 game against the New Orleans Saints.

"If he's not playing in games, he damn sure should not be doing what he is in practice," said the same source who mentioned resentment.